This can be quite a pain I know. If you're stayin' for a while, I recommend the reserve slot: http://www.ibisgaming.com/forums/payments.php. Not a necessity, but allows ya to join till it's truly maxed (not that 19/21 "Don't have reserved slot" stuff).
Anyway! Welcome bro, I tool around WCS and ZM so I hope ta see ya around s'more.