I made a couple charts for weapon DPI (5 seconds) at the 60K tech level. NOTE: Raw DPS is far from the only consideration in weapon balance.
This shows the damage per 5 second increment for 66 HS (3300 tons) of weapons. I chose this size because it allowed an even number of both PBs (6 HS) and 35cm lasers (11 HS) ensuring the numbers are not skewed by a rounding.
One thing you can take away from this is that the point where Particle-Beam 12 DPI passes 35cm laser shifts from about 180k to 100k with this change. That makes PBs pretty strong for raw damage, but even at the crossover point each PB is doing 12 damage (4 armor penetration) where each laser is doing 22 damage (8 armor penetration). The laser's AP remains better out to 440kkm, at which point it also drops to 4, but that's way beyond the range you will be hitting anything.
I think that makes Particle Beams vs Lasers a more interesting choice. The real loser here is actually railguns, but I think that's okay since PBs are dedicated long range weapons and railguns are meant to be short range. Railguns being better than particle beams for most of effective hitting range (2.1 situation) is pretty weird.
Here is a chart at the same tech level with a bunch of other random weapons thrown. It only goes out to the 50% hit mark.
If you look at this chart, you immediately see one of the problems with particle beams today (2.1). The PB6 (unchanged in 2.1 and 2.2) has way more DPI than the PB9 or PB12 right now and the damage template means they all pierce 4 layers of armor. That makes the more power hungry PBs in 2.1 strictly inferior.
I chose to show 20cm lasers on this chart because they require the same 6 HS as a PB12, but one thing to note is that the 25cm laser is superior at this TL despite being slightly larger because it has the same ROF 10 as the 20cm.
One weird consequence of this change is that in 2.2 the PB6, PB9 and PB12 at this tech level all have the same DPI because their ROF is 10, 15 and 20 seconds and they're all the same size.
EDIT: Sorry, did not realize how big those images were.