Taxing 17 improved to 6 skills. I'm just glad it didn't take tons more tries to get something that works out, it wasn't clear at all whether it's really possible to not do crowd control on this level, but luckily I got it working.
Not really feeling motivated to try to adapt this to SNES. All the details have to change because the miner on SNES stops mining earlier relative to the steel block (it has better steel detection for the miner). So right off the bat even the correct release rate number to use will change, and if the initial width of the crowd walking area doesn't end up dividing evenly (it's great that on DOS, you can end up with a width of 150, resulting in a cycle of 300 nicely divisible by 25, which maps to RR 56 or 57), you might even have to do the annoying per-lemming tweaking of release rate to get things to work out. Plus the SNES miner itself moves a little different, so finding the right place to start mining will also differ. It's even entirely plausible that you might run out of time thanks to that version's faster timer.