Can't say I've noticed it gunking up the coil, they usually last me a month or so in my subtank (single 0.5ohm)
Would I be right in saying those harmful chemicals are usually found in the buttery cake flavours, rather than the fruit ones?
I'll check out flavour art, although my favourite is vampire vape attraction, rather than mixing individual flavours
Acetoin and AP can be found in fruit flavours, but yes, they're predominantly in custards/creams.
Looks like Attraction is a mixed berry and menthol liquid. If you're looking to make that, I'd start off with Capella Harvest Berry, TFA Koolada (0.5/1%) and probably something to sweeten it up; FlavourArt Raspberry for example. Maybe 0.5% FA Marshmallow as well.
The good thing about FA is that you only need low percentages for flavour. 4% Max I'd say. With the likes of Flavor West for example, you need anything up to maybe 20% to get any sort of flavour out of it. FA goes a loooong way.
Cheers!

Got to admit, I'm a lazy devil so prefer my base already pre-mixed; however, it could be the time to move along with doing it myself!
Thanks Gee! Took Darkstar from your guide that's always used here (it's a godsend!). Just need to figure out how to get a consistent 6mg mix and I should be set to do this all on my own
If you've bought your nicotine separately, I'd recommend decanting say 30ml or so into a squeezy bottle and using that. You'll get a much better result, especially if you're mixing by weight. If you're not then I HIGHLY suggest you pick up a set of scales.
FWIW I have a 250ml bottle of PG and VG and then a 50ml bottle of PG 72mg nic. I simply fill them up when they're about to run out.
Ideally you want to minimise the amount of oxygen your bottle of nicotine is subjected to. The less it does, the longer it'll last. I don't bother keeping it in the freezer, but I do keep it in the fridge. VG/PG I don't bother refrigerating as VG just becomes a pain to work with when it's cold.
Depending on what ratio you make your juice at, your nicotine is always going to be a set figure. It's only really going to be your PG amount that will change, seeing as pretty much all of the concentrates available now are PG based.
60VG/40PG - 7% flavouring
60VG/40PG - 20% flavouring
Nicotine and VG is a set value. Only the PG you need to add, is changing.