Holy shit dude, your early rolls are completely stacked so far lol
As for 2030, leave it unmerged until you have at least 6 of them in total, which is probably a long way off (or not, at the rate you're going :derp: ) This is because the effect does not increase until MLB'd/Max Limit Broken, which requires 4 additional copies into the base. So for now it is far more useful being able to field 2 copies of it and generate 16 stars per turn. Even once you can MLB it (5 copies) you may still want to field two of it, so that's why you wait for 6 instead of merging immediately.
Another equipment that you'd treat the same way if you run into one is the Kaleidoscope. Don't merge it until you have 6 of them.
As for Knight's Dignity, you're not likely to use more than one copy at a time, so you can merge it freely to raise its level cap if you want.
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As for the gorgon family, you've basically got a full on charmlock team going if you field all three of them. Mostly male focus though, because Medusa is the only one that can stun non-males (with petrify instead of charm) though in that kind of team they do definitely work well together. Technically, in the strictest sense of it, an *optimal* charmlock team would use 1 Stheno and 2 Euryales, but Medusa is perfectly serviceable there anyways. The great thing about this game is that you can clear most content just using servants you like and you don't need optimal teams, so you can do themed parties like that without worry.