Glad your IBS is under control, that's a tough one. I vape max VG and do sometimes put a drop or two of water in the tank, as I use a tiny amount of flavoring, and it is easier to vape/draw that way sometimes....
I don't think 25 nic is outside the range of normal for quitting smoking once more, unless you were smoking very infrequently? Especially if you cannot use flavorings due to a health condition, but I'm assuming you know the sx of nic overload as a former vaper...
Anna