Hey, sometimes the cotton is jammed up in the ports of those coil heads and can have trouble feeding...try poking at the cotton with a needle to fan things out a bit and see if it helps you wick up the juice better...even those those .5 OCC heads have this big suggested wattage range I've found that without rebuilding them they don't really like to go above 25 watts and can start giving dry hits easily by 30 watts which can be quite harsh and nasty tasting, but it doesn't mean your coil is ruined, just need to block up the airflow and take a couple strong unpowered primer puffs to get a good dose of liquid back to the coil and you should be alright. Also, it doesn't make much difference for the mod you're using but those LG batteries are 20 amp continuous drain rated, not 30....for your current setup it's not a big deal but it's good to know if you plan to use them for something like a mech mod or a higher powered regulated mod and and RDA's and really start cranking up the watts.
Don't be discouraged. Playing with cotton anything when you're new to vaping can be tricky business....long before there were factory made coils with cotton wicks and the only way you could get a cotton wick is to build the coil yourself I was actually scared to use it because I was afraid of dry hits lighting my wick on fire...I rebuilt for 9 months with strictly silica, stainless steel mesh, and ekowool before I ever got into cotton and now it's pretty much all I use for everything. Like I said, take a needle or a toothpick and play with the juice ports on the side of the coil assembly and try and see if you can open it up a bit, but not too much so you don't just have juice gushing in and flooding everything, just a bit. I am confident that you'll have it worked out and vaping happy in no time....you have a good setup to start with and it's easy to play with and should, once you find the right settings that is right for you, be fairly "fill and vape" and hassle free.
I wish you the best of luck and happy vaping
oh...also, along with adding juice to the ports on the side of the coil head, it never hurts to add a just a drop or two directly onto the coil threw the top...any more than that and it will flood but a drop or two like that can cut down on your wait time to fire a fresh coil after you install it from several minutes to just a few
Sorry if I am not any help...I try my best and mean well, but sometimes I just miss the mark