As you know that eddy 750 may be one of the problematic ones, maybe maybe not and that some eddys have a problem on the idle circuit when running a wild cam. I'm assuming the float levels/psi are OK (not over 5.5). I would bump the timing up to 18-20 & if that stands you can shorten the slots later. Yes you'd want the "cruise" step or a smaller jet (which as you know the jet will change power and cruise) to be giving you a leaner mixture & iirc WOT to be ~12.5. I'd get the idle sorted out first. I ain't giving you much here to work with but it's a BTT for ya to get things started. PS you want the curve to start ~200 RPM above your in gear idle speed. You want the carb in the ballpark then fine tune the timing then fine tune the carb