I worked at a GM dealership for several years, been in plenty of their modern engines for various issues such as timing chains, oil consumption, cracked pistons. Just keep doing what you're doing honestly. The brand doesnt matter as long as you get it changed regularly like you've been doing.
On a side note,this would be a good time to look at doing something about intake valve carbon build up, just because it's probably not that bad yet. Easier to prevent the problem now than later when it becomes an issue. Once it's an issue it's really difficult to clean those valve. We used to use GM #88861803 and man that stuff would remove most of the carbon like a piece of cake but the smell of the exhaust felt so toxic and was inescapable that we'd never do it inside or directly outside the shop. It had this weird chemical smell to it and you couldnt finish inhaling your breath even if you wanted. Just had to run the [censored] out of there and get some fresh air. We had special equipment for it though, as it had to be atomized into the intake which means you might not have the means to do it. I know there are commercial products too, but I've never tried any so I cant speak for them. But definitely do some research on it and hit those valves with something. The carbon build up initially forms as this tar like goopy stuff, and this comes off with chemicals, but when left untreated more and more of this goop forms and the initial stuff touching the actual valves turns into solid carbon and that requires mechanical removal. Also a transmission service and power steering fluid change is recommended. The fluids in these transmissions do not last for some reason. Atleast not to my liking. Pretty much brown after 60-70k, completely black by 100k and silvery by 130k, assuming it was on the original fill from factory. I throw in the P.S. fluid because why not, since you'll have some dex 6 left over anyways. You only get about 4-5 quarts out of the transmission so you're not getting everything out, seems like doing it every 50k is a good way of ensuring good condition of the trans fluid.