I haven't used the PEG400 so no ideas here. I always waited a day or two before trying the HC. I mix mine in 50/50 pg/vg, so if you are using max vg then maybe a week to steep is good.I did a shake and vape on the HC at 6% and mixed it with peg400. It was harsh and overwhelming in the enthion. The RP was pretty strong too. I’m going to put them away for a week after diluting them some with vg. I probably should have just used vg to begin with since it’s what I’m used to. I might go ahead and mix two more with vg to compare.
Let us know.