I had to do all of those things, aside from monitoring IV sedated patients (which one of my classmates who worked in oral surgery did) and using the high speed handpiece on teeth. I used a slow speed and 8 round bur to remove cements and bonding material when I debonded patients and delivered their retainers. If I was an expanded function auxillary (EFDA), I could use a high speed handpiece (as well as place restorations), but only one of the ortho assistants had that certification. As an RDA I was only allowed to use the slow handpiece.
Everything else looks normal and routine work for a DA, at least in Washington state. Can't comment on Texas.