Problem with new fuel system

Well this morning fired it up cold, after backing of the regulator, which I had cranked up all the way yesterday. It read about 9 and first, adjusted it back down to 5.5. So I think its just the gauge reading low when it gets hot. After a spirited 1/2 hour drive, it's reading about 3lbs. Keep in mind its about 32 degrees right now, so it probably didn't get as warm under the hood as it did yesterday.

I did some full throttle passes from 0 to 80 or so, and there are definitely no fuel delivery problems. No hesitation or stumbling, just hauls ***. I'm pretty happy with the 5.9 swap right now.