Grettings from LAX

I've put a fresh Saito .72 in my Sig Mayhem 40 (fresh because the well worn Saito .72 was on my Buck Rogers when it encountered a "localized gravity storm")

I'm having an issue getting it to idle - as in it won't below 2800-3000 RPM (and "hunts" at the lower end of that range). High speed needle wound up 1-3/4 turns out - pulls hard on a 12x6 APC. Playing with the low speed screw I can get great transition - but no low idle.

One thing that the guy who rebuilt the motor brought to my attention was my fuel. As all my other glow motors are YS - I run 30% Coolpower. The Saito ran great on this before - but as he pointed out the motor is a lot tighter now.

Also - what's the critical dimension from the spray bar centerline to the tank?

Thanks!