sounds like you need to thin that 100%vg down with a little vodka try 5% first then maybe 10%, this is normal for diy in cleros,if i use 50/50 pg/vg in icear 30 get same issue,
coil burns then progressively gets worse,so you need to substitute the vg with vodka or distilled water,
you wont get drunk the alcohol evaporates ;)
100% vg is for drippers imo as you dont have to wick ,just drip and go ;) vape on !!!