I had similar ideas on both, but couldn't get them to work on either.
The Fun 27/Taxing 22 one, on the other hand, is plain impressive.
Thanks, but you updated your table wrong on all four results (Fun 21, 23, 27, Taxing 22).
The exception is Tricky 23 - I know 98% is possible, but doing so is well out of my abilities, so I'll leave this one up to the experts.
I've posted a
replay for that one ages ago at the Lemmings Files Archive. It uses 24 skills (everything but 1 climber), and having tried a few things just now, I'm reasonably sure you can't get by with less.
Similarly, on the Archive I posted some time ago a
16-skills 100% solution for Taxing 23 (and therefore Tricky 8), and having tried a few things just now, so far it appears you can't do better.
LemSteven posted on the challenge thread that
Fun 22 100% can be done with 7 skills. I haven't confirmed this myself yet, only to note that it's not as obvious as it sounds.