I received two Hipshot Bass Extenders yesterday for my MIA P and J. I installed first on the P, which had Dean Markley Blue Steels. The old E string broke during tuning, so I installed a new one. It simply would not return to pitch after flipping down, even after dozens of tests following the instructions. It usually came back sharp, but sometimes flat. I let it sit overnight, figuring the new string needed to settle in. So today I tried several more times, stretched the string a little more, played awhile, put it down, played again, and tested some more. At long last it seems to be working. At least I hope it is. On to the Jazz. I installed a set of Fender nickelwounds, .45-.110tw. (I normally use a .100 E, but had this set around and figured the heavy gauge would be a good match for the Extender.) After installing the strings, I set intonation on all, raised the saddle on the E to compensate for the taperwind, and tried the Extender. After just a handful of tries, it seems to be working fine -- more reliably than the one on my P bass that sat for a day and was played more. What gives? I'm assuming some strings react more to the tension changes from the Extender, and might not be a good match. If so, I'll avoid them, because I don't want to go through this on my P-bass again, especially if I have a gig coming up. (It's a major bummer, because I love the Blue Steels otherwise.) On the flip side, are there any strings folks recommend as especially stable with the Extender?