boost creep

[low compression]

I put a racing beat exhaust on my 88 t2 with the na mufflers i had laying around. At the same time i swapped to a stock turbo i had laying around since the other one smoked a little. I ported the wastegate almost to the flapper and boost wants to get to 12 psi if i go any more than part throttle. All i have not stock on the car is a fcd all stock intake. does this seem to be a bit extreem for a exhaust they sell as a direct replacement. Is my actuator bad. it sucks babying around in my car i cant even pull out in traffic without possibly hitting 10+ psi. Is this normal with the exhaust or do the na mufflers flow more than the turbo ones causing this. Any input would be great