I have the dom1.5 10cm in a 08 STI, stock manifold, my torque did not really go up but hp did, a lot. I'm not done tuning yet so we shall see.
I feel for you about getting beat by a vf car, your tune looks great though. You're not a 1000 rpm back more like ~600 rpm. The overlay of your vf and the dom shows you crossing 18psi at 3250 and 3800. The real mystery is where did the torque go? I would go over the install and check the engine, something is off.
Please stop comparing VD or airboy's dyno with other dynos it is a useless endeavor. Go to the strip and get a trap speed, a true test of power.
FWIW I was moving 282g/s stage 2 and 300g/s now, you just can't compare these it is meaningless. Also I'm hitting peak boost at 3800 in 3rd and 3700 in 4th.
Good luck man