I found this article on BB removal to be very helpful with stubborn cups. From a BF members blog btw. Also Sheldon Brown talks about options for swapping to square taper here. See chapter 2 what to do section 8. When all is said and done you might decide the VO bb option @$50 plus shipping and maybe the tool if you don't have them is the least aggravating way to go. YMMV.