Same here, I've gone back to Middlecoin for now I tried a range of combinations e.g.

expiry: 1
queue: 5
scantime: 1

expiry: 15
queue: 1
scantime: 15

expiry: 1
queue: 0
scantime: 1

Which seemed to be common combos from my searching, but still didn't help much if not made things worse.