It's really impossible to answer that without having a full list of levels, so we can see both how many are on the current list and whether there are any more we feel could or should be removed. I personally would prefer to go with round numbers, so if we have, for example, 174 levels, then finding one more and doing 5 x 35 appeals more than doing 6 x 29.
I am not sure why you are suggesting removing the easy repeats. It's true that RotL is a "best of" the community's efforts from the early days, and the easy repeats aren't authentic products of those days in the same way as the other levels; but they make the pack feel more well-rounded and complete in itself. I'd like to at least have some community discussion about this.
I think it's okay to fix some levels, but it's true that some will be unfixable. I think this is the kind of thing that needs in-depth discussion for each level. I know this is where the amount of work involved really starts to pile up, but as I've said, I'm happy to help out as much as I can, so long as people don't expect anything to be finished very soon. I should have a bit more time and energy once my move is finished.
I must strongly protest against the idea of dropping special graphics levels. As I said, I'm happy to help out with the work involved. Cheapo supported special graphics, so those levels are an authentic part of the community scene this pack aims to snapshot. And several of those levels are mine, so this would severely impact my representation in the pack. That doesn't seem fair at all.