Well, I did it. I got past round 60. I skipped using the fast forward setting and focused on attack speed, bullet speed, firepower, accuracy, and life steal (blood mage). When forced to pick an additional option, I got the burst shot.
While the dice helped somewhat, maybe almost as often it was half-useless, giving me health with one or two cards when I was at full health, especially with life steal. So I mostly stopped using it so I could focus on stuff that helped.