I find it interesting that you use a 4kt design for this purpose. From the Corvette designation, I expected to see nothing larger than 2kts.
Have you considered using something similar to this instead?
Wolf II class Frigate 5,000 tons 128 Crew 1097.4 BP TCS 100 TH 160 EM 0
3200 km/s Armour 5-26 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 2 PPV 24
Maint Life 2.12 Years MSP 274 AFR 100% IFR 1.4% 1YR 82 5YR 1227 Max Repair 180 MSP
Intended Deployment Time: 24 months Spare Berths 3
Magazine 208 Cryogenic Berths 200
160 EP Magneto-plasma Drive (2) Power 160 Fuel Use 54% Signature 80 Exp 10%
Fuel Capacity 505,000 Litres Range 33.7 billion km (121 days at full power)
Standard Missile Launch Tube (4) Missile Size 6 Rate of Fire 30
Missile Fire Control FC28-R20 (1) Range 29.0m km Resolution 20
Missile Fire Control FC129-R100 (1) Range 129.6m km Resolution 100
Sparrow ASM Mk. 2 (34) Speed: 21,300 km/s End: 81.3m Range: 103.9m km WH: 12 Size: 6 TH: 248 / 149 / 74
Active Search Sensor MR108-R100 (1) GPS 18000 Range 108.0m km Resolution 100
For an additional 1,000 tons of yard space, you get a more durable vessel that doesn't require additional infrastructure to reload its magazines, has more than double the deployment time, and houses its own sensor. Speed is roughly the same, and range, while less, is still more than enough for its purpose.
I operate these in detachments of 5. They're very, very nice to have around when nothing else is available, and they make great pickets on my outlying colonies - Just plop down 5k worth of maintenance facilities, and they are good to go.
On the other side of the spectrum, I currently have 2 PDC designs I use on my major worlds (And the occasional asteroid conveniently located near a hostile JP).
Mountain class Planetary Command Center 30,000 tons 518 Crew 6579 BP TCS 600 TH 0 EM 0
Armour 17-86 Sensors 1/1800 Damage Control Rating 0 PPV 80
Intended Deployment Time: 3 months Spare Berths 26
Troop Capacity: 5 Battalions Magazine 448
Surface-to-Space Missile Battery (10) Missile Size 6 Rate of Fire 15
Planetary Missile Defense Battery (20) Missile Size 1 Rate of Fire 5
Missile Defense Fire Control Center FC16-R1 (5) Range 16.2m km Resolution 1
Missile Fire Control FC129-R100 (2) Range 129.6m km Resolution 100
Lionfish AMM Mk. 2 (208) Speed: 32,000 km/s End: 1.3m Range: 2.5m km WH: 1 Size: 1 TH: 490 / 294 / 147
Sparrow ASM Mk. 2 (40) Speed: 21,300 km/s End: 81.3m Range: 103.9m km WH: 12 Size: 6 TH: 248 / 149 / 74
Active Search Sensor MR10-R1 (1) GPS 180 Range 10.8m km Resolution 1
Active Search Sensor MR482-R20 (1) GPS 36000 Range 483.0m km Resolution 20
Active Search Sensor MR1080-R100 (1) GPS 180000 Range 1,080.0m km Resolution 100
Naval Air Station class Fighter Base 30,000 tons 327 Crew 4437 BP TCS 600 TH 0 EM 0
Armour 19-86 Sensors 1/180 Damage Control Rating 0 PPV 20
Intended Deployment Time: 3 months Flight Crew Berths 123
Hangar Deck Capacity 10000 tons Magazine 1768
Fuel Capacity 5,000,000 Litres Range N/A
Planetary Missile Defense Battery (20) Missile Size 1 Rate of Fire 5
Missile Defense Fire Control Center FC16-R1 (10) Range 16.2m km Resolution 1
Slammer SRAM Mk. 2 (270) Speed: 18,000 km/s End: 22.3m Range: 24m km WH: 8 Size: 4 TH: 180 / 108 / 54
Lionfish AMM Mk. 2 (688) Speed: 32,000 km/s End: 1.3m Range: 2.5m km WH: 1 Size: 1 TH: 490 / 294 / 147
Active Search Sensor MR10-R1 (1) GPS 180 Range 10.8m km Resolution 1
Active Search Sensor MR19-R20 (1) GPS 1440 Range 19.3m km Resolution 20
Strike Group
30x F-18 Wildcat Fighter Speed: 13061 km/s Size: 4.9
5x K-135 Pelican Tanker Speed: 9600 km/s Size: 10
Strikegroup:
F-18 Wildcat class Fighter 245 tons 5 Crew 88.2 BP TCS 4.9 TH 32 EM 0
13061 km/s Armour 1-3 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 1.8
Maint Life 0 Years MSP 0 AFR 49% IFR 0.7% 1YR 6 5YR 93 Max Repair 48 MSP
Intended Deployment Time: 1 months Spare Berths 0
Magazine 12
64 EP Magneto-plasma Drive (1) Power 64 Fuel Use 332.63% Signature 32 Exp 20%
Fuel Capacity 15,000 Litres Range 3.3 billion km (70 hours at full power)
SRAM External Rack (3) Missile Size 4 Hangar Reload 30 minutes MF Reload 5 hours
Fighter SRAM Guidance Package (1) Range 25.9m km Resolution 100
Slammer SRAM Mk. 2 (3) Speed: 18,000 km/s End: 22.3m Range: 24m km WH: 8 Size: 4 TH: 180 / 108 / 54
K-135 Pelican class Tanker 500 tons 3 Crew 124 BP TCS 10 TH 48 EM 0
9600 km/s Armour 1-5 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 0
Maint Life 0 Years MSP 0 AFR 100% IFR 1.4% 1YR 18 5YR 270 Max Repair 24 MSP
Intended Deployment Time: 0.5 months Spare Berths 3
32 EP Magneto-plasma Drive (3) Power 32 Fuel Use 336.02% Signature 16 Exp 20%
Fuel Capacity 315,000 Litres Range 33.7 billion km (40 days at full power)
They might not seem like much, but my first 2 squadrons of Wildcats managed to knock out my next-door neighbours shipyards by staging through the JP with Pelican support. Don't underestimate the value of planet-based strikecraft.
In addition to the PDCs, I plop down a brigade's worth of Mobile Infantry on each world, plus a few Garrison battalions. Does the trick.