What is the base % then.. ?
Even if it provides another way to get a 90 set.. why decrease the chances to plus it? It's hard enough to plus gear not only that 90 gear is no good till you core it and you gotta plus it to do that. And if it turns into 90 set will it be plus 0? Because that's even worse. xD
We can't release base rates on reinforcement; Lets just say its anywhere from 40-45% maximum.
The reinforcement rate only drops by 3 levels per piece.. when you compare the sets the drop in reinforcement is negligible; The player still receives a net increase in overall stats with the possibility of even greater improvement, over the old sets, in the future through additional reinforcement.