I just got back with some results. I put a bolt in the boost line and clamped it.
Before, unloaded on a level road at WOT, the most I ever saw was 8 PSI and could easily get 1100 degrees EGT's.
Tonight, after unplugging the boost line, on the same stretch, unloaded at WOT, I hit 13 PSI and let off at 75 MPH. I was astonished. And with my foot to the floor I could not pass 1000*. I maxed out around 950 and the difference in acceleration was definitely notable. After shifting into overdrive and flooring it, I climbed to 75-80 much much faster than before. I also had a much more noticeable turbo whistle throughout most of the RPM range.
With all that said, I think I will go along with sycostang and adjust the wastegate rod and reattach the boost line. Is it as simple as unhooking the rod, and threading it back shorter then reattaching it until you get the desired boost?
I hope this is helpful, and thanks in advance for any advice.