Need Advice on Rear End Gears

I currently have a 2001 GT, Vortech v2 with intercooler, Kooks lt headers with catted x pipe and magnaflow catbacks. I'm making 380 rwhp. My tuner suggested going with lower gears to "wake up the car" and make up for some of the torque I lost when installing the headers and intercooler. I dropped about 2 lbs of boost and am now at 8.5 lbs. It is only in the higher rpm's that I feel my car really take off now. I currently have stock rear end, 3.27 gears. I am thinking of moving up to 3.73. Right now I am running Michelin Pilot Sport A/S 3+ 285/40zr18's on the rear. I get great traction and never worry about excessive spinning when flooring it. Will 3.73 gears create excessive loss of traction, and will I still have any functionality in first and second gears?

Thanks for any advice.

Thanks for the info