Here’s the question: do these 2 Crossover settings compete with each other?
Yes, they do. If your sub has a crossover defeat switch you should use it, otherwise set it to the highest Hz possible, and re-run. Let your AVR set everything. I'd read the manual to see how much the Audyssey will do for you. If it does not set crossover points, then set everything to the THX standard, which is 80 Hz. If you have unusually small speakers, you can set it higher, around 100 Hz.
Also:
30 Mz
You mean Hz. :)