Yeah, that is the whole problem that I have with Terrain, and it is also why I love Terrain, you know, if the Terrain isn't there half of the turns, then I can get a new one, but then my consistency is low and it doesn't work.
Anyway, you are a great mathematician and you definitely found out some of the best strategies, I wouldn't be surprised if you were able to reach floor 60.
But now I wonder, is there any situation where getting a "gold glass Heal and Block" is worth it?