I think what you've got is about as good as it gets. I'm using a sealed battery now so no worries about water levels any more. I did use a couple wet cells before this, and have always used them for many years on my bikes. Adding water periodically was just something that had to be done. I don't recall ever having a battery boil dry on me. Apparently I never had a bad over-charge problem. But back then, I never monitored or checked charging rates that closely. Even with my 650, I didn't start close monitoring until I had the bike for several years. It always charged and the battery never went dead on me, so I was happy, lol.
This 650 has been a great teacher for me. I had a pretty good general knowledge of bikes already just from owning and riding them for so many years, but this bike has taught me so much more. One area in particular has been the charging circuit. I never knew 14.2 was ideal, or anything about the different kinds of regulators. When I finally did get around to closely checking my 650's charging output, I found it wasn't that great, only in the mid to upper 13's. Then I discovered I had an adjustable regulator so I "fixed" the problem. Then I discovered that even though I upped the output, it wasn't very consistent. I "fixed" that with the automotive regulator.