Take time to enjoy the music . Members on the forum have lot of experience and opinions on the various cartridges that work on the deck and I'm sure you will be hearing from them .
Like other forum members have said , welcome to the group . I see you are already well down the rabbit hole of new components and no one has found the cure yet or a ladder to climb out .
Old school here with a phono stage built into my Conrad Johnson PV 10 tube preamp that I purchased as a demo in the early 90,s and retubed a couple of times . When it's cold you can warm your hands with the heat given off by the 4 tubes.
Tinker first , sell last . Like Renpar61 suggested , I also have some records that have a lot of noise no matter how clean . Compilations can be notorious for varying sound quality related to recording source . Oh the joy of listening.
In my system I upgraded all the interconnects , power cables , wall sockets and isolation first and found a major improvement . I decided to stop at that point as the ears are getting older .
My suggestion, take a deep breath and enjoy it for awhile before doing anything . In my system, my volume never gets past 1/8th due to the nature of the system . At a volume level my wife allows I do not hear any rumble between songs , but again I do not tend to crank the system up to much ...
I do the same think , also using a small humidistat in about the same level as you note . I have rug floors and without the humidifier running in the winter its shock city . This winter, not some much, as the temps have been warmer then normal and lots of rain and not snow .