i've had 3 powerex's skins, only snapped one in 5 yrs ..Overall , more than happy with them. last one bought in 2007
they all had sloppyish joins, .... i can't remember if they were snug when i bought them and this has happened from wear and tear;;; or if they were loose from the start.
What i can tell you; is the machine that finishes off the end has always been off. They have a small gap on the join, when both ends are pushed together, because the ends are not cut off straight

it doesn't really matter because once the downhaul is on, the mast halves are going nowhere.
BUT
I've got to be careful when rigging, double check the that the masts haven't slipped after downhaul applied,,, can be a pain in the arse when your keen to get out and u got to de-rig, or if u forget and sail with a big gap in the join,, hello snappage.