Start over.
- Shift to small ring in front and big cog in back
- Take microadjust to the middle setting. It has 33 total, -16|+16
- Adjust the B-screw to so it just doesn’t have the jockey wheel hit the big cog
- Shift to the 5th cog from the top of the cassette
- Adjust the high and low limit screws by backing them out a bit so they don’t get in the way of adjustment procedures
- Get into adjustment mode
- Pedal the bike and hit the button that goes to a bigger cog until you just hear the chain rattling on the next biggest cog
- Press the button to go to a smaller cog five (5) times then get of micro adjust mode
- Try shifting through the gears. You might need to fine tune but generally not from there.
- Shift to the largest cog. Adjust the low limit screw to where it just touches the stop
- Shift to the smallest cog and do the same thing except then back it off one full turn
- Next step is front derailleur adjustments.
I’ve seen it happen where someone micro adjusted so far it skipped to the next gear and caused issues. You’ll want to go through these steps to make sure that isn’t the case. I have all the tools to check the hanger too so it could be that but I would check this first just to rule it out. The other things to check is make sure the hanger it installed tight and the cassette lock ring isn’t loose. Those two things can also cause issues like this.
Hope that helps. Here is the link to the manual if you don’t have it already: https://si.shimano.com/#/en/iDM/RX815/adjustment/toc_xd_42bdf4421e6322e8-3cc6b207-166e81b15e9--7b9a