General AFR Guidance (Holley Tuning)

After some online digging, this off idle stumble seems to be a VERY common issue with these Street Avenger carbs. The fuel curver seems to be way lean right out of the box. Since the WOT AFR was lean on my 670, I opened the stock jets (65 and 68) three sizes to (68 and 71). I also popped the carb off to have a look at the transfer slots. From the factory, NONE of the secondary transfer slot was even close to showing, naturally, to compensate, the primary slot was pretty long. So I split the difference and put the carb back on. Once I got the idle speed back where I wanted it, with a 13-ish AFR, I took it out and the stumble was a lot less (with a 35 squirter and stock orange cam in the #2 hole. I know you're only supposed to make one change at a time, but I had a feeling the secondary idle speed was way off.

As of now, the larger jets made a big difference as did dialing in the idle AF and transfer slots. There's still a pretty good lean stumble just off idle (definitely better than before), but WOT AFR is 12-ish. Since my idle AFR and WOT AFR are decent, how should I richen the transition? Higher PV? taller accelerator pump cam? I've got everything I need to play with the tune except power valves. I'll need to order those.