Fran I didn't mean to confuse you either.
I don't
vape more than 10% PG I am PG sensitive.
I DO find my mixes brighter and less sweet using PEG40 than VG alone (I'm at 10% PG, 40% PG400 and 40% VG.
I find it better and more flavorful than VG only.. That tastes muddy.
I genuinely don't know if PEG400 would give you anything MORE or DIFFERENT than PG on its own.
It MAY or MAY not be worth a shot. PG AND PEG400 both cut down on sweetness (based on my very limited experience with PG) but I DON'T think PEG400 would give you a lot of magical lack of sweetness ANY more than PG, necessarily.
Again, it's hard for me to compare it because I am PG sensitive. I LIKE PEG400 a lot, but ONLY compared to max VG, that's about all I can say for it. I think it IS less sweet than VG and a better flavor carrier.
I do NOT (in my limited opinion) think it will magically make flavors ANY less sweet, it will carry flavors and is LESS sweet than VG so probably a little less sweet but ONLY compared to max VG flavors.
I hope this helps a BIT.
Anna