the turbo im running right now will be over 10psi by 1500 rpm. its not a vnt turbo its a Holset HE221w with the 6.5cm exhaust housing. admittedly im running a large pump which does speed spool a lot but even before i swapped in a super pump it was fully lit by 2000 rpm. that being said for a manual with no TC to allow slippage to help spool my best recommendation for bumping the off the line power would be to advance the pump timing as much as you can without it nailing and throw a 2.5* cam key to advance the cam timing slightly which makes an appreciable difference. if you are willing to go a little farther you can port match the head and manifolds and get a more free flowing exhaust. you wouldn't think the stock one is all that bad but i saw a dyno run with the stock and with just the down pipe off the turbo and the open pipe showed about 15-20 more lb/ft of torque.

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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P