If it came across like I was suggesting that, I'm sorry.
Bold added to the crux of what may be the issue.
RPM drop of 30 is good. A/J may have a better sense of this cam than I do.
We're both suggesting more throttle and that may mean less initial timing. I was thinking 16 but maybe its going to be strongest at 14* 750 rpm.
Open the throttle, see what happens with respect to rpm.
Then take a few degrees out of the timing or whatever it takes to get back to 750 rpm. Fiddle with the mix screws - should need more open.
Test it shifting into Drive.
Also whether its burning your eyes.
Then see what the AFR meter says just for the record.