Thanks for the hunting report. It makes me feel good to know that my molds are being put to a worthwhile use.
As for the meplat, there is no black and white formula to predict how a given meplat will shoot in your gun, with your load.
Personally, I have never had much luck with meplats larger than 75%, and even the 75% meplats have to be pushed fast in my guns or else accuracy falls off.
But, I have seen 90% meplats shoot nice groups without even trying hard -- in someone else gun, never mine ! ! !
I dunno if your gun will shoot an even fatter meplat, but I rather doubt that the deer will tell the difference between 81% and 85% or whatever. You poke 'em in the right place with that 81% meplat and they won't run far.