I guess your right, it was very warm/humid & I had just popped into the car without it cooling down. The leather is definitely not perforated/ventilated like the Lexus cars. Alcantara would certainly fix this problem though. I might investigate the cost to cover the face (not bolsters) of the front seats, although I suspect it won't be cheap.
Yeah the wheels will be far easier to clean that's for sure. I used one of them cheap conical polishing attachments on a cordless drill which worked a treat 😉 using the medium pad first then finishing with the soft with the appropriate polish.