Ok, after much thought and consideration on this I think ive come up with a fix. I really like the silent death setup and I dont want silent death to change. So what needs to change is indeed the grease gun, but to be exact, the grease gun's ammo. Right now if I am not mistaken, the grease gun ammo is set to a 1/1 damage modifier with no + or - to targets DR/DT. Maybe try adjusting the ammo to be more like 10mm. Or maybe scale it down from 1/1 to 3/4 or 2/3, or just apply a + target DR value that wont completly ruin the smg. But I really think the problem is with the 1/1 dmg on the ammo, since with brd x 3 you are getting +7 dmg a bullet. So, the tl;dr of it is just to adjust the grease guns ammo to suit its new potential as a close quarters battle weapon with silent death.
And on a similar note, I just noticed .45 ammo was changed to take 2 junk now, I already have enough problems mining without a personal mine, and I feel that I better fix would be to make it 2 alloy.
Now, lets talk about standard crit bursters that use new things like spray and pray.
Ive also been working on a pure critical burster that uses assault rifle with more crits x2, brd x 3, better crits, spray and prey, and bonus rate of fire. If you want to balance pure critical burst back in so its not just destroyed by big gun bursting and SD, then give a new perk that can be taken instead of bonus rate of fire.
Here are some examples I was thinking of, they might not be exactally what needs to be done but you get the idea.
Example: Violent Death - You love a real horror show. Your attacks with 2 handed small guns have an added 10% Critical chance and +10 on critical table. You also ignore targets DR by 5%. - This might be a little over powered for snipers though, but im not sure yet.
Example: Eagle Eye - You think you've seen it all in the wastes? Well, now you have. With Eagle Eye, you gain the ability to detect sneaking foes within 15 hex. You also ignore targets body armor effects if they have sneak up. - Might be over powered, but it would give pure critical burster an edge in tc vs silent death, so long as this perk works for assault rifles only pretty much.
But yea, just trying to give some constructive input, I really love this game and I just want it to be fun for everyone playing. If anyone has any other ideas on how we can keep these builds without breaking perks and making people remake then post it up!