Sometimes I think it is the juice itself.
I've noticed some juices "burn" easily. Perhaps turn down the voltage you are vaping at if you can? Also, sometimes the thicker the juice, the more difficult it is in the EVODs and you get the gurgling and spitting, at least that is what I have found.
Then again, I only use my EVOD for vaping on work breaks now. You might want to consider going to a mechanical or box Mod soon if you like real thick juices, and getting a dripper.
Good luck!