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Welcome to the forums!
Quick thoughts:
No dispute comments because the common mortgage software doesn't distinguish dispute comments vs. disputes: mortgages will not be underwritten with a disputed account period except maybe in the jumbo space or portfolio lender, and this second one is not common at all. Disputes are weird, some stay active for a lot longer than they should, so just get the comments removed. See instructions in a sticky in the Mortgage forum.
Utilization has no memory so either get the AU paid down or off your account. Going to suggest off because you can and should be saving all cash you can for the mortgage, and if you're not in any way responsible for that debt, get rid of it.
Finally stop making any credit applications, at all, until after the mortgage funds and you have keys in hand.
(I did ask for this thread to be moved, probably to the mortgage forum)