More Tricky Results and improvements.
14: 5 of each, lost 4
20: 5 of each, lost 1 OR 6 of each, lost 0.
Replay for the lose 1 solution. No need for the other replay because the stoner on the left can easily be replaced by the stacker with up to three walkers available to keep the other lemmings from falling off.
21: 3 of each
Went around the body of the second "6" sparing the fencer that was instead used to cut the middle 6 again.
24: 2 of each, lost 2
I reached the ledge with 1x, but lost too many lemmings, so 2 looks more likely to be the final result here for fewest x.
25: 2 of each, lost 2 OR 4 of each, lost 0
Found a quicker and more reliable way to contain the others. Replays attached.
27: 4 of each, lost 2
29: 3 of each, lost 1 OR 4 of each, lost 0
Replay attached. Used clear physics (including trigger area placements) to my advantage here. The counterpart is easy, as I swapped a left-edge Stoner with a cloner and stacker.