Re: Hunter's Eye
Agreed, but I don't think INT-based PER necessarily implies heightened senses. Rather, I feel that INT is acceptable since it implies that your PER is based, in good part, on how much attention you are paying.
Many people can be exposed to the exact same stimuli and take away varying levels of perception of what happened; some might not even know anything was going on! INT can model the person who, DUE TO their experience/wits, recognized that SOMETHING their senses caught is SOMEHOW significant.
So in your example, the people with poor PER capacities might just have it described as "He's wearing cologne." Not even "floral," since the association with flowers is so well known (don't want to unduly influence the player). Heck, they might not even get the descriptor that he's wearing cologne, I might just leave it out entirely. Even though the character smelled it, unless someone asks them after the fact (and even then, not always. How many often have you had trouble remembering something obvious that you weren't paying attention to in the first place?), they might not even get that detail.
The high INT/PER character..... "He smells strongly of a floral cologne. Give me a roll...." Or even "He smells of the X flower," depending.