@DV: I never ran into that problem, although I've heard it alot. I know you prime your new carts but I'm sure some people don't.
I've only used carto tanks on a Provari.
Have you looked at, tried or know of anyone that has been using the Big Daddy Vapes stainless steel tanks? I just put down $60 for one last night and hoping that it won't crack.
http://bigdaddyvapor.com/index.php?main_page=product_info&cPath=12&products_id=53