Under performing genny

[monty]

I bought a couple of these when they were on offer for £7:50 focalecig.com/Product/Mini-Atty-Genesis-Style-Rebuildable-Atomizer-with-Glass-Tank-Silver-2-0mL--12698 . At 12 Watts they produce as much vaper as my others do at 8 Watts. The culprit seems to be vapour re-condensing on the base and the inside of the chamber. No problem wicking. The deck is 14mm across and about 1mm thicker than an agt. The chamber is a bit bigger (taller) than the AGT. The top cap weighs twice as much as the agt, 45% more than a mini DID and the air hole is 1.4mm. and at the same height as the agt. The coil is 2.3 Ohms, .32mm micro coil - coils close together but not touching which is how I've got my other gennys set up.

Any ideas? Would reducing the air hole help, don't want to waste time doing that if it won't. I'm guessing I'm going to have to file or sand down the top caps.