Here is a response to your 90s MC wake question at lower speeds. This is based on using, selling, and teaching new skiers with MCs in the 80s and 90s. Perhaps this will help you.
1986 MC is very good. Wakes on 87,88, 89, 90 are larger.
91,92,93,94 MC are quite good.
All these previous boats have spray at shoreline.
95,96,97 have less spray but not better wakes at lower speeds and 15 off as 91-94.
If I had your goal I would look for an 86 or maybe a 94 as the 94 had fuel injection.