Yeah thats seriously lacking down low. I know I run a smaller turbo, but I hit peak tq at about 3400rpms. Your turbo should not be 2000rpm laggier than mine...I guess I also have stock cams though..

What rpm did you start the pull at? Cause it looks like it wasnt even wide open till like 4500 at least..I mean, 145hp at 4200rpm? Really? Thats 2.0 NA power...

Im gonna guess wastegate malfunction.