I did end up going back to check my base success without buffs. I had a 94% base at 174 skill on il150 items. I gained 0 - .01 skill until 175, and still gaining....slowly. I can pretty much desynth anything I want and only go back to it if the MB doesn't have the mats I want. I am not going to do any 160 dungeon drops in case they add new mats to them when they put in red scrips and such, so I don't think I will end up capping just yet.

Also, has anyone desynthed a non-alchemy item and been able to get the dissolvent back? I can get every other mat but those no matter how much I desynth.