I didn't notice any changes in the eyes of Fiorella, the foster kitten I took back into care from the adoption center when I saw she wasn't recovering from her cold. She had the dry version of FIP.

It doesn't sound like your Bentley has FIP. Perhaps he had it but has thrown it off, in which case he will test positive to the antibodies. Repeat URI's seem to affect the eyes though only in terms of occasional discharge which you say Bentley doesn't have.

Some bolstering of his immune system - Lysine on his food, vit.B complex, that sort of thing might help him since getting through 6 URI's in ?about 3-4 months is a lot.

It can be a bit nerve wracking to be told to observe because the vet doesn't quite know what is going on. I rushed Challenge to the vet this morning because he had a major blood and blood clots poop late last night but the vet said it was probably a temporary irritation from stress, getting into a different food, etc. and he wasn't really concerned. I felt a combination of relief and frustration because I'd rather get a definitive answer.