I've checked and re-checked, all lines look good... Great, actually.

I reset the ECU again and the car ran pretty nicely; perhaps it's a combination of the [serious] need of a new tune, the slightly different length of the lines (this could be menial or inconsequential), the recent heat, my overly conservative driving style over the last week (had $50 to spend on gas), the fact that my girlfriend incessantly uses the A/C, and a gremlin?

It's not as fast as I know that it should be, but I launched it in the wet today on a long strip of back road -- hit 96-97 mph in 9.999 seconds on the stopwatch even with all that wheelspin... Did it again, got a really crappy launch (way too much wheelspin) and hit 100 in 11.760 seconds... Halfway decent numbers for being wet, I suppose...