If you click on 'configure HUD', then 'HUD options' there is a box which you can tick 'show stats from current tournament blind level only'.
I might be wrong but I think this probably won't help much unless you've already got a decent amount of hands on a player. If HUD is resetting stats every level against unknowns, then you'll never reach enough hands within a blind level for the stats to become particularly meaningful. Be interested to hear what others think on that...
That is an issue, Which is another reason i suggest using HEM. Im able to set up my filters, and say it resets when the 6th player is eliminated, i can simply, double click the HUD, and it shows the stats from the entire game, it's really handy having that feature, something i dont thinkn PT3 has got.