Now ive sorted the turbo boost (well i think i have - boosting 8-10psi now) ive still got hesitance. If i feather the throttle it drives fine, and if i floor it it now flies. However if i drive with the throttle mid way it like hesitates.

Now the car used to be owned from new by my nan and i dont think she ever floored it so im wondering if its something to do with the throttle sensor or something?

How can i check this?