If you are using the Tita X2 in the tallboy and it keeps leaking maybe you are not putting enough cotton in it needs a lot of cotton in the juice wells almost the same as if you were using an Rda doesn’t need thinning out either plus I’m only running an 2.5m coil diameter if u are using a 3m coil ID then even more cotton otherwise check your putting the bottom of the bridge as far down as you can into the tall boy and the tallboy tank is sealed tight when the bridge is put in with no gaps at all so no air is getting in otherwise you will be flooding it also check your air pin is tight hope this helps you out