If you as devs think that throwing all "load to guides" to evo in that type of puzzle, works best for you, then do it. I suspect that it doesn't do much of anything except protect the soloist board for those. If you then have to "fix" evo for that type of puzzle only, because you have shifted the problem from one board to the other, then do whatever complex scoring you have to do to make it fair to all. IMO, simply disabling load to guide for only that type of puzzle would simplify things better than doing something that just moves the problem to the evo board. Or as Mark said - have us do these without points (the fact that you give these more points than normal seems to have backfired).
Both personally and as a team admin, I would not like to see "load to guide" disabled for other types of puzzles, for the advantages that others have already pointed out. Other than a design puzzle, loading to guide & trying to band to it may be a good exercise, but is rarely successful in resulting in a better soloist score all on its own. So I see no reason to change it for any puzzle other than design.
Personally, I do not care one hoot what you do with the individual evo scores. Most experienced and/or good folders don't care, either - and I'm taking this from conversations in global and other conversations with not just my team but members of other teams. Most experienced folders know that the solo scores are the ones that count in the community's eyes.
But as a team admin - I care very much what you do. Not only is the evo scoring relevant and important to new or returning folders to practice their skills (and pump up their self-confidence), but there are many puzzles in which hard work results in one team or another surpassing another team's soloist or evo from soloist.
Please note that the hard work usually takes the form of banding, hand builds, searching for an offbeat or unusual or older script. Occasionally, it will take the form of walking something to death, when there is a very tight race.
If you set up a system that penalizes the "whatever" number of individual evo scores within a team, then you will have the danger of two likely outcomes: the better folders on a team will hold back or not even load an evo, so that their teammates who really want to do evo can - and/or you set up a strong competition within a team instead of the friendly one that now exists.
If you set up a system where the rank comes from number of points of improvement from the soloist upload, then for sure soloists will do a quick starting wiggle, then upload. Not much point in that. If you think that squeezing out another couple of points from a very walked evo is worthless, please take a good look at the scoreboards for the last couple of months - there have been instances of teams squeaking by other teams by doing just that.
Please be very sure that "fixing" this "problem" of individual evo scores does not cause worse problems. Most folders have lived with the system, as imperfect as it may be, without much complaint, simply because the team folders who stay (with the exception of a very small minority) move on from caring about their individual evo rank, and focus their skills on providing the best solo for a team.