I came across perfumey flavors in my "pre-Dawn" days and I had no clue about flavor mixing or what might have been the cause, I simply happened across her flavors and now have a drawer full of "junk" juice (aka pre-Dawn juice) that I either fix up with Lorann's flavoring or give away to new vapers ... I mean this stuff is so terrible I had a guy give me back the free bottles I gave him LOL.
Anyway back on topic from my tangent, I came across this symptom from a guy just getting into DIY mixing on another forum and he suggested that it was the brand of flavoring he was using... Cap-something... at any rate they had some flavors that had a strong alcohol content which translated into "prefumey" when vaped.
He switched to a flavoring that didn't contain alcohol and this remedied the situation. You might want to contact your supplier and see if they are using a flavoring with alcohol in it. I would be HIGHLY interested in knowing if this is the case as it might clear up the "perfumey" enigma.
P.S.- Sata if you're reading this; no, the juice I sent you is not from my "junk drawer" it's from my Dawn stash
