on my wismec rx300 im running a smok tfv16 with the single mesh coil rated at 120w (best coil ive tried so far) which calls for 70/30 according to the instruction manual for the tank. the coils seem to not wick that great and burn fast but when i tried 75/25 it leaked like crazy which doesent make since to me because wouldnt that be thicker? any suggestions? contemplating trying 60/40 but again i dont want to deal with leaking.
What's your wattage?
For the leaking, close the airflow before you open the cap to fill the tank. After you fill and close the top, turn the tank upside down for a few seconds. While it is still upside down, open the airflow, then slowly turn the tank rightside up and put it back on your mod.
Anytime you get dry hits, the juice is not keeping the wick saturated enough to keep up with either the air or the temperature you're vaping at. Turn your watts down and tighten your airflow a little, and try not to chain vape. You'll get better flavor that way, too.
If by 70/30 you mean 70VG, 30PG, that should be fine, and yes 75 VG, 25PG is thicker. It may just be that the vacuum inside the tank didn't get properly established. That's what turning the tank upside down does.