Could you elaborate? Do you get better vapor production, flavor, etc... out of other KR808 batts? I know she tried the Blu and said she couldn't tell she was smoking and tasted like warm air (methol lights carto).
If you look around here on the forum, especially new members forum where people just bought blu kits, you will see - blu is usually not recommended here. They are not a good kr808 kit. BUT sometimes they work in the sense that they get people started on e-cigs, but they usually are not using their blu long and upgrade soon afterwards. But for vapor4life kits, or smokeless image kits, which are also kr808, a lot of people are very satisfied with them. Better draw, longer cut off times, better cartos and better flavors, as well as excellent customer service from these companies, make them great. I use both and like them both.
Tho I have not found a juice I like yet from smokeless image, tho I hear there ry4 is good. But v4l has a lot of juices and I have a few a like there. I get most of my juices from other companies, but for kr808 hardware, both of these companies are great and blow blu out of the water.
I have NOT heard that using 100% pg makes for a cooler vape. Your set up - 1.5 on 3.7 volts, makes for a hot vape.
PM me if u decide to start her out with a kr808 kit from one of these companies and I will help you out. Most of us start with a cig sized kit, kr808s or 510s, and a variety of juices to try, then go to fancier stuff later from there. I now also have a couple vv egos and a couple box mods, but I still use my kr808s too.