Yeah, .022 seems a bit wide. Try .018 and set your timing a couple degrees above spec. and leave it there. Now of course no two 216's are the same but, we advanced my neighbors 216 a few degrees from spec. and it seemed happier, more responsive.
Now with your engine fully warmed up and vacuum gauge connected are you getting the highest steady readings with mixture screw right where it is at 2 full turns off seat? Try leaning it out while viewing the gauge. Turn in small increments, 1/8 or 1/4 at a time and allow engine a couple seconds to react. What's the verdict? Points, timing and mixture make any difference?
