My oil changes went something like this.
200 miles, 400, 600, 1000, (changed to synthetic here) 5000, and every ~5000 miles afterwards.
I've never understood the "lot of adjustments at beginning" for chains. Are new tolerances in the chain itself, or between chain and sprocket that far off that it has to "wear in" or something?
I did have to fiddle with mine when it was new due to being misaligned from the dealership and not immediately realising the adjustment marks were inaccurate. When my replacement chain went on ~28K miles later, except for having to redo my master link 100 miles down the road because I goofed the install, it didn't need adjustment or get adjusted untill the next rear tire change 3k miles later. The next time it was adjusted was ~7k miles later at the next rear tire change.
But yeah, check your chain alignment, and don't trust the adjustment marks.