The rev 2 romset does not have the slow down bug seen in Rev 1. It also changes the difficulty up for Round 138+ in a way that breaks down the usual "notch" pattern we have been using for years.
This is the best way I have found to manage these rounds up to the kill screen so far on this romset. You need to make perfect turns at the start with no delays or monsters will break off and follow you up the first vertical shaft you dig after the first rock drop.
If you don't want to dig the extra dirt you can just grab the fruit and go for the other highest rock on the far left side of the screen for the last two monsters.
Round 138+ Fruit + Dirt Pattern Rev 2