I use a mini Protank. I have learned that when putting a new coil in, if you don't give it 20 minutes to prime, I end up with poor absorbing for the life of the coil. As far as suction feed goes, yes sometimes the coil does need some air, I lay mine on it's side. I've learned to take nice longer slower vapes, not by much, but less fast than I used to. That all has solved my problems.