DK, I have a few comments. I'd use YPAO, but set it to skip the speaker size and crossover settings and manually set those at all small and 80Hz crossover. Your M60s have good bass, but your EP500 is even better, so you should let it do most of the work up to 80Hz. For a similar reason, I question the BOTH setting, but if you really like it better it's your choice, of course. The minimum -10 trim on the sub is worrisome, and even though you say that the volume control on the sub is only at about 1/3rd, try it even a little lower to see if the receiver sub trim moves up into a measurable range above the minimum -10.
