Mites? Or?

[Dollythehun]

I've had this plant going on two years. It was outside last summer and I noticed silvering on a leaf. Figuring it was spider mites, I treated it. It bloomed like crazy and this year I kept it inside to avoid any chance of mites. Low and behold, last pictures, I see pitting and silvering on a new leaf or two.

I've wiped the leaves and see no streaks. I do see few tiny dark dots, pinprick size, which fall right off the Kleenex used to wipe. I first sprayed it with Bayer 3 in 1 which says it kills spiders, and contains synthetic nicotine (Leisurely just posted about some dendros bring sensitive to this compound). I have been spraying with dish soap, alcohol and water at 5 day (or closer intervals) for about a month. When I wipe the leaves I see a black dot or two and on most leaves, nothing. Today I noticed a couple yellow leaves on the oldest canes.

I wonder if I injured it by spraying? Did it really have mites? Am I perhaps underwatering?

Humidity and temp are both in the mid 60s and I water once a week maybe a little more often. Light is bright indirect. Nothing else seems effected. Thoughts?

First photo is old damage, second one is new.