I'm fairly new to vaping, and manual batteries have been a life saver for me. The automatic batteries didn't work for me. They don't kick in fast enough that I can get a decent amount of vapor from a mouthful, and if I inhale directly into my lungs, it feels like I'm going to cough up my pancreas. I've got manual batteries now, and I hold it near my mouth, press the button for a second or two, which lets the heat build up a bit, draw the vapor into my mouth, release the button, then draw in outside air as I inhale into my lungs. It sounds more complicated than it is, but it's how I manage to not cough on the PV.
I do have some flavors that don't make me cough, but they don't list the PG/VG content. I'm going to try contacting the vendor and see if I can find out. There are places that let you specify your own mix, if I can find my sweet spot, I think I'll be much happier.