I think you should just get both: the LK6102S-MLT and the LK752S-MMHT, just so you have all possibilities covered.
Seriously though, I have been looking at the same rod for some time. Since you already have the LK632S-LMLS, the 7'5" rod seems to make sense, for all the reasons you listed.
My budget dictates buying my next rod in 2021, so January 1 will be New Rod's Day for me.
I still have a big hole in my rod collection, and now I have a kayak. I'm fishing for crappie, bluegills, and small trout in ponds and small lakes. So the 6'10" Lunakia is better for my situation. But I'm going for small fish in more open water with little/no current. I want a sensitive rod that is fun with small fish. If I start catching bigger fish then I might be coming back for the LK752S-MMHT.
If you follow through, please post a review. I would love to hear how it works out for you.
Scott