Turbo help!! asap lol

[CJ_Derv]

Right well ive got the td04 on and checked wastegate welded arm and its solid so cant see it opening wondering what else could restrict my boost when hitting 25psi+ now the turbo inlet feed has a soft silicone elbow on at the turbo am i being thick here? Is this squashing shut and making the boost drop rapidly as there is fuel there but seems to knock off just over 3.5k

The pump us gov modded and ran over 5k boost with k14 and t2 but had solid pipework

Just wondering if anyone could help as im stumped here

Cheers CJ