As promised, my results for the Other Rank are here, and you'll be pleased to know that they're all possible without requiring an update! Replays for all except 2 and 8 attached in the bundle.
1: 10 of each
2: 0 of each
3: 2 of each
4: 6 of each
5: 7 of each
6: 2 of each
7: 6 of each
8: 2 of each
9: 4 of each
10: 10 of each
11: 3 of each
Also, I decided to go back to Present 6. I managed to find something solvable at last, but not without losing lots of lemmings thanks to the time limit.
I scrapped the Gliders and used walkers first, particularly on areas where they fell the second and third times; and the most I could get was 26.
Following on from this, the next method I tried was using stackers to redirect the lemmings. The right stacker is fine but when you come to do the left stacker it has to be positioned at the bottom of the valley otherwise it will start stacking a pixel lower, therefore wasting some frames trying to complete the redirect. The terrain layout was helpful in that walking the stacker after he completes the seventh stack will ensure that no lems from the opposite side will get trapped. While the stacker was building I used cloners for all the lemmings in front of the 26th, particularly as they fell. With 98 as the requirement I had to click the same button 72 times! With the left stacker positioned differently as well I also had to remember to turn the 26th lemming round to get him home too.
My result is: 72 of each, lost 74.
EDIT: Also confirmed Sunsoft 1 is possible. Really starting to get more creative with those gliders now! Base result is 22 of each, lost 32.
SECOND EDIT: Yet another level I can confirm as possible! Present 15, which can be done with 50 of each, lost 50, and probably my favourite nuke solution of the lot. The process is similar to Sunsoft 1, but the terrain layout is more complex. With the steep drop, I had to use all the gliders again, but I also found a way to create a "chain" of lemmings 1 pixel apart using a cloner. I had to wait until all the lemmings are out before attempting this trick. After getting the latest lemmings into position with walkers and a 98 RR I then simply clicked the cloner when every last lemming hits the wall to create this wonderful chain.