Ok now that I took a look here's the very interesting thing:
1.the vanished one was 329th - as you can see in the event window, remaining 13, ranging from 316 to 328, survived and proceeded to board. However, as you can see just at the very bottom of the screenshot I took showing casualties during boarding attempt, 329th survived according to these reports - it lists 21 riflemen dying from this formation and then states that 30 are remaining, yet 329th never appeared in any logs after this. The shuttle it was on was Gauntlet MkII 014 if I remember my setup correctly.
2.A little less than 40% for each soldier given my speed, their speed and boarding combat capability.
3.Well, looks like it was more or less 60%, aligning with their survival chance.
4.Not a single scratch on any of them.
5.yep, 1 shuttle - 1 formation, grouped in squadrons of 2 so when I give order to board with all formations on one fleet it's two shuttles using two formations.
Nope, Pikes are these things:
Pike class Assault Ship 16,370 tons 512 Crew 6,528 BP TCS 327 TH 1,260 EM 6,240
10996 km/s Armour 10-57 Shields 208-520 HTK 84 Sensors 0/0/0/0 DCR 5 PPV 72
Maint Life 0.64 Years MSP 2,046 AFR 429% IFR 6.0% 1YR 3,204 5YR 48,054 Max Repair 1575 MSP
Captain Control Rating 2 BRG CIC
Intended Deployment Time: 6 months Morale Check Required
Internal Fusion Drive EP1800.00 (2) Power 3600 Fuel Use 33.75% Signature 630.00 Explosion 15%
Fuel Capacity 1,000,000 Litres Range 32.6 billion km (34 days at full power)
Theta S208 / R520 Shields (1) Recharge Time 520 seconds (0.4 per second)
Particle Lance-18 (2) Range 320,000km TS: 10,996 km/s Power 55-4 ROF 70
Particle Beam-9 (4) Range 320,000km TS: 10,996 km/s Power 22-4 ROF 30
CIWS-320 (1x10) Range 1000 km TS: 32,000 km/s ROF 5
Beam Fire Control R450-TS16000 (50%) (2) Max Range: 450,000 km TS: 16,000 km/s 98 96 93 91 89 87 84 82 80 78
Tokamak Fusion Reactor R23 (1) Total Power Output 22.6 Exp 5%
Tokamak Fusion Reactor R5 (1) Total Power Output 5.2 Exp 5%
Active Search Sensor AS3-R1 (50%) (4) GPS 5 Range 3.5m km MCR 314.7k km Resolution 1
This design is classed as a Military Vessel for maintenance purposes
Gauntlets MkII are my shutttles. But my fleet didn't consist of them solely, there were also other ships and some happened to take damage