IMO, the Razortrick by Slicktrick would be my #1. I actually only tried them because I called Slictrick one day several years ago for a question and the owner told me they were his most accurate head. I am sure you have thought of the ST but perhaps not the RTs. I personally hunt with the German KineticXL and the ST with great accuracy but I do not know how the GK would stack up as the "most accurate"
I have never used them but I hear the Ramcat and the heart craft are very accurate. If I am not mistaken, the owner Aerovane had a hand in the design.
I am sure with the question, we are throwing out the "bow tuning" "proper spine"and "form" factors of this.