should i be runnin a 70mm tb with a 73mm MAF

What did you set the TP sensor to? If your answer is "???" then that could very well be the problem. Probe the center wire (the othe connection being ground), Key on engine running, and at idle- should be set just under .99V...I like .90-.95 myself. If it is over 1v, the PCM can assume you are tipping into the throttle and add fuel.

If you dont have a need (engine mods) for a larger throttle body, it can hurt performance. You can tend to loose a bit of torque, and possibly gain a bit in the upper Rpm's.