10% Ethanol. Car aspirates then surges forward after 0.5-1s Throttle closure and boost oscilation seen while logging.

Let’s say I’m in any driving mode including sport+, it’s more noticeable at higher rpm like 3k+, When I floor the car with wot it takes like a second before delivering full power. Even if I use the anti lag function, Foot flat allow anti lag to build boost then when I release the button, foot still flat, it lags for like maybe 0.5to 1sec then it boots. Even if I’m just in gear at like 3k rpm or even lower or higher, And I floor it, it takes a second or so till it delivers full power. I’ve taken a log with multiple wide open throttle pulls and one clean pull in 5th gear from about 2500rpm to 6k. It does it weather tc is on, in traction mode or fully off. Please let me know what you think I’m dealing with. I ’ve got new cold spark plugs, All 6 brand new coil packs, recently serviced, quaife lsd, Michelin ps5 at the front and pss at the back, currently on mhd stage 2 91octane with stage 3 xhp. I’m really chasing my tail trying to figure out how to remedy this problem. I’ve also reset throttle and load adaptations to no avail. Initially I thought it was throttle mapping (hence my earlier query) but now I realise that it’s another issue since it would not persist with rolling anti lag if it were a throttle mapping issue. I’ve also noticed that that car is a bit choppy on partial throttle.