Ps
With regards to surge, you can DRASTICALLY alter your position on the map by playing with cam timing.
Dial it in for overlap and you lessen the chance of surge, dial it in too far after BDC for closing and you greatly increase the chance of surge.
Do you know about compressor maps JJ? as to understand cams on a turbo car (especially in terms of surge), I feel a fairly good grasp of them is an absolutely essential bit of background education.