Although the Bully, Big Bully, Thing Lives, Ultimate Inferno and Solid Uranium are all part of the new very strong resin oilers, the others, Total Annihilation, Rule, and the Xtreme X Factor are probably stronger in their overall reaction and their backend BECAUSE of their asymmetric cores and their very strong mass bias differentials. These last four will almost flip on oil, but not quite. The y should be noticeably stronger, if that's what you need. The first four are already super-strong, huge hooking balls already, more than enough for the average or even the tournament bowler.
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