Hey. I also remove the chad and also ream out the hole to round (scissors) and I haven't had leaking on any type A/A-lr/B/B-lr.... And I haven't had to readjust wicks so far. I also use all VG - including nic ejuice, an 80:20 VG blend VG:H2O - the base of the flavoring is some VG but likely mostly PG - all Decadent Vapours/TW stuff. I'd be suspect of some thin PG's like JC's ejuice. And enough power vaping will heat up any juice and breakdown the viscosity some.
It's either though the hole, cap or through the spike. If it's losing ejuice through the hole then I think the tank isn't seating properly againt the metal 'disc' holding the spike - perhaps the length of the atty chamber is out of spec - not allowing it to seat. Just guessing here

OR if not that, then perhaps you got shortchanged on the wicking - you could bulk it up a bit with silica rope or if you have some CE2's laying around - grab a piece from that. See Vicky's video esp. wrt the metal mesh 'cap' around the wicking.... some have reported not having these and I think it would tend to block the flooding of the coil, etc.
YouTube - eGo-t wick adjustment
thanks Kent,
yes my juices are rather thin, i use just little VG (15-20%), mostly PG.
What do concern me is that i had no leaking issues with typeA's using the same juices.
What i think is that typeB's do wick a bit more than A's,
that's probably why they seem to produce more vapor..
but the more wicking might make them more prone to leaking with some juices.
Anyway i'm using just 2 B's out of 5 i purchased,
will check another one tomorrow to see if it holds my juices better.
Today i have checked A's and B's spikes side to side.
I noticed that the 3 little channels inside B's spike seem a bit deeper than the ones inside A's spike,
also B's do have less wick material inside the spike.
conjunction of these 3 elements might be the reason why B's do wick more and perform a bit better than A's:
1. deeper channels inside the spike.
2. less wicking material inside the spike.
3. larger tank.
on the other side this may be too much wicking for some juices...
i'll go on with experiments.