AOE damage and scaling with concoctions

I've been playing poison and shattering the last 3-4 days and they're super fun but the aoe is very wonky. The "explosion" which is supposed to have a radious of X, when you face north for example and drop one at your feet in front, if there's an enemy behind you most of the time it wont die you need to turn around. If you do a 1.5 or 2 or 3 meter radius from your feet it'll go behind you.

I've also noticed that stacking AOE passives doesn't really seem to affect the radius of the explosions I've tested with items and passives, it's really weird. Obviously with shattering the ice chains and makes it look larger when it's really not.

Can someone please check into this. Lots of people have stopped playing concs post bow skill change, I started after heh. It scales decently but no where NEAR skills like spark, ice strike, tempest flurry etc could do with a base damage increase on all of them to bring it up to speed with the others.

PS magnified area and concentrated area have 0 effect as well - tested

PPS how come you have a quality setting on conc's and you can't add quality to them? :(