Probably because you have been off for the bike for so long you have lost your "Condition" . Aftermarket poncy Bar-Ends are too light sometimes for an SV and don`t help to dampen the Vibration that can ripple through these , try to source some OEM ones or Chewy does some Stainless Ones that weigh a ton and will help reduce this .
I have also heard of a thing called a Bar-Snake for motorocross/naked bars which dampen it down a bit and they also do a liquid version for Clip-Ons as well
