Struggles after 4900 rpm

Yes.

You stated it ran excellent after your previous adjustments. Then you changed the filter and now have issues. Makes me wonder if some of the rubber line got up in the carb, did you use new line?

Yes for a while it did run very good and I had no pinging/detonation. Same thing after the filter change. The issues did not start directly after that and my my rubber lines a not even a year old.