Rotosounds damage truss rods with their increased tension from the monel alloy. I stand by my comment about Chromes. You must have amazing hand perspiration chemistry, because you are the only case I know that Chromes do not go zing then thump. Again, for everyone else, Chromes are bad strings that need reformulating and should not be on any bass whatsoever.That was my experience with Rotosound 77s, not Chromes. The 77s died within four months without warning the way you described. Never again!
I've had my Chromes on one of my Ric 4003s for the last 18 months or so. They have aged well and sound better than they did in the first 6 months (break in period). They're still much brighter than La Bella DTFs, my favorite dark flat, even after 18 months.