First thing to check is the center positive pin on the Phoenix to see if it has been pushed up too far into the threads. The ProVari pos post obviously can hit it, but maybe not the LT. Press firmly on the small half-moon shaped plate at the bottom of the Phoenix juice well under the coil.
Like mentioned before, I also used sealed shorty 510/510 and 510/eGo connectors to get added clearance with some devices on the LT.