Since no one else is likely to try it, I'm going to get Hail 6 out of the way now. Here's a solution for Hail 6 saving the maximum possible (57%, or 46 saved) without using the blocker (ie. 0 skills).
(For explanation of why 57% is the maximum possible, see
this post.)
As before, I used purely the relationship between RR and lemming spacing to work out the solution, no computer simulations (even the kind where you make use of the Lemmix text replays) needed. The original blocker solution conceptually divides the savable lemmings into 3 single-position groups, and try to compress them all neatly into one of the 3 groups. The blockerless solution here instead recognizes that the later the lemming comes out, the less precise you need to compress it to an "optimal" position, because of the increasing extra time they have to walk to the exit.
The zip file contains (in addition to the Lemmix replay) a text file explaining the basic strategy noted above, as well as an explicit "English" solution telling you when exactly to change the RR to what.
[edit 11/30/2019: re-attached missing zip file caused by forum migration side effects]