My $0.02 - I'll go on record for having said this - you'll never find a fixed blade broadhead that shoots to the same point of aim as your field-points.
I don't care what the manufacturers say. Sorry manufacturers.
I've tried a whole bunch of them with a Tac15
(and other bows) tuned by me and tuned professionally and they do not shoot with field-points.
However, the Rocket Steelhead XL 100gr mechanical does.
They shoot with FP's just fine out to eighty yards.
I'm now on my 13th deer with this head and the Tac15.
That's 13 one-shot kills. Every one a passthrough.
Admittedly ranges were all inside 25 yards. (Two at 25 yards).