Sounds like you have all your angles covered!
On a side note, it sounds like you are using a bucket with spigot as your primary fermentor.
I would like to stress that sanitization is the #1 important thing when making beer. Given the fast take off of your 1st batch, and the inclination to take hydrometer readings to be sure fermentation is done, I can tell you have done your homework! So sanitization probably will not be an issue...
However, one thing I learned the hard way is that the plastic spigot actually disassembles into three plastic parts. (not including the washers). I bring this up, because in about 6 months to a year, if the spigot is not taken apart and cleaned/sanitized, you may find that your beers will start to have some funky flavors due to “infections.”
(I personally battled this for a year when I had an issue with my bottling bucket… great beers were turning sour 6-8 weeks after bottling… I lost 6 batches until I found the issue!)
Essentially, there is the spigot/valve that slides out (probably red in color), and that slides into the inner sleeve. The outer sleeve is the part with the threads, and the inner sleeve slides into it… and they are a pressed fit. What I found is that beer slowly seeps into that fit, providing a growth medium for bacteria. So essentially, after enough time, you have a big enough colony of “baddies” in a hiding spot that even with great sanitization practices, you cannot sanitize. (unless you periodically take the valve all the way apart).
I have not found an “elegant” way of taking the inner and outer sleeves apart, and have gone to just buying a new spigot every 3 months or so.
The bottom line is that in the short term, you should be fine, and I have talked with some people who have gone years and had no issues.
It looks like you are off to a great start!