I never leave a cap off for more than an hour. And that only happens if a juice package is especially perfumey when I get it, I'll do a short warm water bath, followed by cap off for an hour. Leaving the caps off for longer than that is asking for trouble IMO as you've found.
I'm finding the longer it all steeps the stronger the throat hit gets with VCV. Especially the fruits, I can't do Harvest Berry, Straw Gwab etc because of this. CtG is not as harsh as the others. The leftover fruits have already been traded off but I still have that Vanilla tobacco for whoever called dibs. I'm leaning towards some of the flavorings, the added distilled water, or both. Sadly this has been driving me steadily out of the VCV camp now that I've tried thicker 100% VG without the distilled water added. Just a guess on my part but you are not the only one Yotdawglife.
I'm finding the longer it all steeps the stronger the throat hit gets with VCV. Especially the fruits, I can't do Harvest Berry, Straw Gwab etc because of this. CtG is not as harsh as the others. The leftover fruits have already been traded off but I still have that Vanilla tobacco for whoever called dibs. I'm leaning towards some of the flavorings, the added distilled water, or both. Sadly this has been driving me steadily out of the VCV camp now that I've tried thicker 100% VG without the distilled water added. Just a guess on my part but you are not the only one Yotdawglife.