Two more tweaks:

-The dealer now rolls each die independently, and chooses which die to roll second based on the outcome of the first roll. This means the dealer's rolls will be significantly better.

-The dealer now always shows you the lowest of his two die rolls (or the die tied for lowest). Not sure how valuable this info is for making dice roll decisions, but it's surely got to be some kind of advantage for the player...

I think I have actually made the game pretty hard now. If so, I could tweak to make dealer only show his highest roll.