[brianid]

In order to get this "huge" PA3 angle, are you holding the club at the base of the little finger of the left hand, instead of placing the butt of the club up under the heel pad?

Butt of grip/club under the heel pad. However, to to have as acute as possible pa3 angle, the other end of the grip I pull it up more (nearer the wrist) towards the palm as possible where the index finger can still hold on to it tight (it's actually on the palm already, NOT on the index finger; it's actually on the callus directly behind the big knuckle of index finger). So it's really as across my palm/hand/arm as possible without sacrificing stabilization of the grip. And to further ensure the acute pa3 angle as possible DURING the swing, especially when pa2 kicks in, I really HOOK my right little finger over the knuckle of my left index finger. I find that when the pa2 releases, the pa2 momentum/inertia would always make my left wrist unc0ck more than "level" state. My solution, in addition to keeping the left wrist flat or slightly bowed, is to also REALLY hook the right pinky over the knuckle of index finger. I find that concentrating on this, to my surprise, is more effective than concentrating on a bent right wrist and pp1. And yeah, I also concentrate on pp2 (to achieve the flat left wrist), but not just the last 3 fingers, I also include the index/1st finger; it prevents unc0cking beyond level. I think this is the main advantage of the overlapping grip, you can use all the fingers of left hand, you need all for that delivery line roll, pa3-based release, right?