You have two changes at once here. You cannot attribute anything until one of them moves.

Reference ranges differ between labs, so comparing two reports is close to meaningless.

How do you tell the difference between the drug working and just a good week?

Ten percent cuts, of the current dose not the original. That is the arithmetic that keeps it survivable.

Worth asking what specifically was measured. Pain scores move with mood and function does not.

Loose evidence and no evidence are different, and people overcorrect in both directions.

Check the register yourself rather than trusting the number printed on the site. Not on the non-prescription boundary but the pattern is familiar.

Half of what people describe as tolerance is a change in the underlying condition, and the two need different answers. Currently on diclofenac myself.