Leaking issues... It is a bottom coil with a bottom wick. I almost wonder if it is normal to have a small leak. Maybe you are not vaping it at a high enough voltage, and you are pulling too hard, thus the wick is working too well to get juice to the coil, and your coil is not performing, so where does the excess go? Right down the bottom connection. BTW, don't use cotton on these. Cotton works too damned well.
I have NEVER had a leak with my PT 2. I rebuild them using 32 gauge kanthal and a twist of cotton ball. Works great, the cotton wicks great but has never leaked. In reply to the OP, never had a stock coil leak either. Hope you figure it out!