My daughter and I use Kanger single coil tanks, and generally us 50/50 eliquids. My daughter recently discovered an eliquid brand that she really likes (Strife) at a nearby B&M that is 70 vg/30 pg. So far, we have had absolutely no problems with this eliquid in our tanks - maybe the coils don't last quite as long, but, then again, we both like sweeter/darker eliquids, so there is no real appreciable difference in coil life to us.
As others have said, if you think the eliquid is too thick for your equipment, just thin a bit with distilled water. If I have to dilute an eliquid, I just do a drop or two at a time right in the tank.