I also use an ATS, and I don't even need to harvest it but about once a month.
I've never been much of a fan of roller mats - it always seemed like too lazy of a process with too many "what could go wrong" variables. Plus, you've still got a rotting, dirty roll of filter to deal with at some point.
All those things said, I've always loved using
mesh filter socks, which I wash once a week (but I can go 2 weeks if needed).
Testing?
I mean, my Trident tracks the big 3 - that's it. Haven't tested anything else in years, but that's after having this system dialed in and running for a long time.