In general, stabilizers just mask problems in the rest of the system. However, it's not unheard of for a brand new fully rebuilt 60 to have death wobble for no apparent reason- just ask Stephen from ORD. I read a thread a while back about now they tried everything on a new front 60 and nothing but a stabilizer would stop the wobble. So, to answer your question, if you are having no problems with it now, just run the one stabilizer.