I have a model 3 performance I picked up 12/04/18. It has been to a supercharger only twice, when I first got it, before my home charger was installed.
I have a tesla wall connector, and have a 60 amp circuit, so my model 3 chargers at 48amps, the max it is able to charge on home charging.
My commuite is 37 miles each way to work and back. I used to split time driving my car and my wifes car to work to "share the miles" but I enjoy driving my model 3P so much more than her X3 M40 that I really cant bring myself to drive her car to work anymore. I have 11k miles on my model 3 as of yesterday,
I have my charge set to 90%, I plug in every single time my car hits the garage (whether I run an errand on the weekend, or I commute to work). I have solar with Net meetering 1.0 and I do NOT have a time of use plan. Its actually better for me to charge when my solar is producing if I can, so I just charge when I get home. There is never a time my car is in the garage and its not plugged in, and its set to 90% and has been set to 100% a few of times as I had trips to LA or down to san diego to get on a plane and wanted as much charge as possible.
Sometimes (kind of frequently actually) My car hits my garage on friday, and does not get driven again till I go to work on monday, because we use my wifes car to run errands around town. It sits at 90% all weekend in my garage, plugged in.
I say all that to say, the TL ; DR version is, I plug in all the time, charge to 90% and dont even think about "charging routine" other than "plug it in".
after 11k miles, my 90% charge is still 279, just like the day I brought it home. I charged to 100% for a longer drive the other day, and my 100% charge is 309 miles, which is actually HIGHER than it was when I first got the car. When I first got it max charge was 306. I ran it down, charged it back up, etc and was sure there was something wrong with my battery because the rated range would not charge to 310 like It was "supposed to".
I took it in, tesla told me "its fine it takes some time etc etc". I didnt believe them but they would not do anything, and the car was fine otherwise, so I just chalked it up to "computer stuff" and hoped it would not effect me long term. Fast forward to now, and the car charges 100% to 309 instead of 306 back then, so not only have I not "lost range" I gained back a couple miles that were "missing" in the beginning.
Like I said, I do zero thinking about "charging routine", plug in every single time I get to my garage, even if I do run errands in my car, and it frequently sits at 90% all weekend in my garage. I have experienced zero battery apparent battery degredation (I dont use third party apps, so have no idea what teslafi or stats app would say about it, and dont really care what they would say at this point). No BMS reporting issues, etc. Part of it could be how much I drive, but OP you drive a similar amount.
I think you are fine plugging it in, charging when your time of use plan dictates, and not thinking about it further than that.