backfire and breaking up issues

[oLemurs]

Hello everyone, my sr20det s13 has been having issues when it gets into boost it will backfire very bad. this only happens when the engine is very warm and it seems like it gets worse the warmer it gets. when the engine is cold i can get a good 3-4 WOT pulls before it starts to break up and when it does break up usually it backfires alot and stops accelerating pretty much completely. this issue only started happening after i swapped in my s15 turbo, here is what ive looked over. new copper plugs, tried .22 .25 .28 gap and no change. R8 coil packs upgrade. the only other new parts on this is my used HKS adjustable wastegate. any help is appreciated and before you start YES i did use search but its been months that my cars been down and i cant seem to figure out this shitty issue. also it throws no codes for anything.

also boosts to around 13 psi and holds it until it starts to break up