You should be fine with the stock heads at 60/40, Eric. The only juice I've had to remove wicks for was Boba's and a 20pg/80vg I use. The nice thing about the Kangers is the multitude of options available to suit every user. The heads are cheaply replaced and/or with a bit of time and patience, easily rebuilt. Obviously you're almost always going to get better performance from these little guys with a self-made wick and coil. I use 32g kanthal and
Aunt Lydia's. Most recently I've been
experimenting with using ss mesh in the protank. Very happy with the results so far, nice clean flavor from the ss, and I just use several strands of bamboo in place of the flavor wicks that sit on top of the coil to prevent flooding issues. It doesn't gurgle, it doesn't dry hit. I've TRIED to make it foul up, and I can't!
Check out
Todd's review and rebuild of the eVod head... It's the exact same process with the protank since the heads are practically the same, so you can get a good idea of what's in store if you decide to rebuild your own!