I think he's asking if anyone has changed the core with good results (Type D with Type A core hybrid). As everyone seems to be trying, put an old Type A core in it and see what happens.
Man, i have the old mold, no matter what, it pops XD
even in the tightest tension.
The old mold seems to be good with rubiks.com diy core, but nto sure of the new molds
Keep the core, switch the screws to rubiks DIY without the little black washers. Friend said Gungs told him to do it, and it works great. Doesn't pop, turns great even when its tightened.