Can't help much with the OCC's.. Other than try a new one, make sure you put 5 big drops in the center and a drop in each side hole and let it set a couple of minutes before you put in in the base.
As to the RBA, did you dry burn it AND rinse it before inserting the wick? Before putting it on the base, make sure you put a few big drops on the wick after you have the tube portion (without the top) on. Put the base on your device, give it a burst of power then put the RTA top on, and insert it all back onto the rest of the Subtank. This is how I do it, using premade coils at .5ohms.