First play with launch RPM, you want to have the turbo in boost and still not loose traction.
Work on your shift points. I hit second at about 30 MPH, third at about 60 MPH, fourth at 95 MPH and fifth about 120 MPH.
Then there is the question of fuel capacity, are you running a big enough injector/s.
Also there is fuel management, which believe it or not can be messed up by not installing you BOV correctly. A lot of ricers racer wantabees want the noise of the BOV. This results in engine fuel starvation. Do you have enough fuel pressure at peak boost.
What about ingition control. You might need a add on unit or a flash programing for the change in inlet air temprature, boost and throttle position. A MSD unit might work, there are other choices.
Try a different AR ratio, you may want the boost sooner. Most compressors can work with other housings, so a different cartage is not needed.
What about your gear ratio's, maybe a different set of gears would help out. This includes the transmission gear choices, and the transaxle gear choices. It will affect top end, but if you don't need to go 140 and can be happy with 135, it might help.
What about the cam, tubo engines need a low end torque cam. Most often aquired cheap by using one out of a car with a automatic. There may be better choices, but often these cams produce more torque and can be easily found.
A one shot nitous set up will help on the hole shot. But if the injectors are marginal, plan on a engine melt down.
The final thing I have to say should have been said first, but it is too late to save your pocket book some grief -
Get a super charger instead.