Ya I joined late as well, I was able to buy enough gushing to do all my slots but 1, which I had to fill with Vers 3. (Well aside from my sole slapper)
Thats why my gear is now also stuck. The 460s I have, I am stuck with they have gushing. Got a 475 for slot, no way to put gushing so dead piece.
I even got a 450 belt, but its gushing so its stuck.