Which is why I was hoping average hand strength would be unbiased but I actually have never tried it.
If this isn't enough I always wondered if using average hand strength + it's variance would be helpful at all.
Just to clarify AHS != HS or EHS, it's the average rank of a hand given all 7 card combinations... which now thinking about it might actually turn out to be pretty similar to EHS.
Regardless, another approach would be to rank against a top 10% range to get away from the 100% range. Or something more elaborate that apparently has been around since 2006 and earlier:
http://pokercoder.blogspot.com/2006/07/ ... hands.html which is what propokertools.com is using for its rankings.