I did 7 drives today, tweaking the VE after each run. One thing I noticed is that the fuel pressure is not staying consistent. It's fluctuating quite a bit at idle (+/- maybe 3psi?), so who knows what's happening on the road. I was finding the fatter I made the VE the more lean surge I was getting. This has to be a mechanical issue.

I have an external regulator on a shelf which I will use, then I'll alter the OEM regulator (currently made adjustable) and turn it into an accumulator to help cushion any fluctuations. I can't tune it if pressure is not consistent and stable.

We'll see if that makes a difference.