Flooding with high VG juice means its either an equipment problem.... or more likely (far more likely) you actually thinned the VG too much.
All of my VG juices are 80%VG/20% everything else. That everything includes flavoring (pg or alc based), dw, sweetener or any other additives. If however your flavoring is also VG based shoot for for no less than 70%vg/30% everything else.
So if you have 70%vg, 20% flavor, add 5-10% dw to it.
I have been expirimenting with pga for throat hit and have seen decent results halfing the dw amount with pga in final mixes.
Vg is thick but once you hit below that 70% threshhold, say 65% or less you will have issues in some equipment. The ratios I use above will work in ANY AND ALL attys, tanks, etc.
I dont know why but it seems Ive been repeating this alot for high vg users lately.
To the OP's origional question you can leave it uncapped as echo says. However your juice will oxidize and the nic strength could lower some. His point on adding the nic after will definitely prevent that.
However I find heat is the answer and it aids greatly in the steeping process. Mix your juice and throw that bottle uncapped in a hot water bath for three hours in your crock pot at 125% (thats usually the low setting but use a thermometer to check). I use a mini crock pot I bought for $2.50 at a thrift store. Best juice making tool I ever bought imo. You'll shave two weeks off your steeping and it will make the flavor better, not worse.
Echo... use heat. It works.
