Have any of you tuned a 1.8T, mainly AGU ME3.8.3 with a Naturally aspirated cam in?

Im struggling to find any real answers on how good the gains are from a one.
I have the following spec:

K03s
forge actuator (yellow)
THS intercooler
Forge 007p (yellow)
calibra turbo yellow injectors
VR6 MAF housing
Forge Intake pipe
Pipercross panel filter with nice cold air feed.
Stage 2 custom remap
248bhp 278lbft

Im going to add water meth, Ported Exhaust manifold and potentially a inlet cam.

Spec of the cams are:

058109021.B = APX, ANB, AEB,APU, AJL, AGU, AQA, ARZ, AJQ, APP, APY, AUL           7,67mm,      190°,        18° n.OT

And the NA cam:

058109021.D = ADR, AGN         8,41mm,      202°,         12° n. OT

Anyone know any solid information about the NA cam in the turbo engine?