I know this is an old thread but I noticed that my Bastila Shan was failing to dispel taunts on Mace Windu's auto taunt under a mirror teams Bastilla lead. I put potency mods on her and now she almost always dispels enemy buffs. I realize this is not part of her basic attack as in the cases above, but this seems to suggest that potency checks do apply even though the language of the ability description seems to guarantee that the dispel will land and apply. Its annoying I hate to fill mod slots with potency when I could have CC. Just my unsolicited 2 cents.