I'm another pg allergy sufferer.
Strange tho, was vaping for around 10 months before i even realised i had a pg allergy. Over the following 6 months it just got worse, I was getting less and less tolerant to it. Ended up i couldn't even handle 5% of the flavour concentrates.
Long story short, I'm now mixing with alcohol based flavour concentrates from Vapingzone in America. Took a couple of weeks to get here, was worth the wait. Been quite impressed with a couple of the flavours I've tried, will definitely be ordering some more.
Their Honey Flue Cured Tobacco is nice, quite sweet but no overly sweet. Peach was actually peachy tropical juice like, none of that acidic chemically nastiness.
Hope that helps, I've had no adverse affects since switching.