Good to hear, I've read that the low end response is really good with the AVS2 boosters too. I went back and forth as to getting the 650 or 800, then read in a tuning book I have that if WOT vacuum is under 1" the carb is too big, and if it's over 1.5-2" then the carb is too small. My 750 hovered right between so think I'll try the 800. I'm often told the 650 would be better around town and for general driving. (I think that's true, I used to have a Performer 650, plus I got a bit better mileage with it.) ....But I have this brother I run against at the strip every year and he thinks he's faster (sometimes) so WOT is important. :D
I'll report back if the 800 seems too big.