I load with a 550 and I haven't noticed any problems metering Solo 1000. It is bulky enough that a double charge in 9mm is obvious so that's a plus. When I have a chance I will put a larger sample over the chrono top see what the deviation is like.
As far as cleaning out the moly fouling, good luck. I used liberal amounts of Hoppe's semi auto solvent, wore out a bore brush and followed that with 1000 rounds of CMJ. There must be something that cuts this stuff. I'm not a fan of scrubbing bores. Hopefully it won't be an issue with Solo.