But my Russian 91% have leaking issue too. It leak at the connection part. Mine is the spring version. At first, it leak a little which I have no problem with it. After a while it will leak till flood the whole mod connection and cause the ohm to jump from 1.5 to 2.6. Change the insulator of the Russian but problem is still there. I bought the new kayfun lite 3.1 after that. So far, the best tank I used was kayfun lite 3.1. I like Russian strong flavor taste but unfortunately it leak on me.

No problem, bro.

Here's my current vapping setup.

Yeah... I tried Aspire Nautilus, Expomizer, Russian 91%, old and new version of Kaifun lite 3.1.... I still prefer Kayfun Lite 3.1 due to problem free (slightly minus on the flavor taste compare with Russian)