Which other ones you got? Although personally I have always liked the draw of the tightest ones...I have a few other BB setups but they are much looser than the kayfun.
On a couple of kayfun Lite clones, I did drill out the holes under the wick ends where the liquid is drawn up. With my preferred 100%VG, I found that to help a lot. But these kayfun BB decks are so tiny, it is probably super hard to even find an appropriate sized drill bit, let alone see things and get in there and do it without breaking something!
CRSS- is that d80 a built-in LiPo battery?