Name: Big Bill Livonia Michigan (Zone 6a) If you need to relax, grow plants!!
I think that your growing conditions are fine.
Any insect damage I can think of does not look like what your images show. Same for fungal or bacterial issues. Hence my concern. It could be insect damage from the underside of the leaves but then those yellow kind of circular/oval stuff I see does not look like insect damage. At least not that I can recall in all my 45 years.
It is not heat stress or cold stress plus your temperatures are fine.
Orchid lecturer, teacher and judge. Retired Wildlife Biologist. Supervisor of a nature preserve up until I retired.
