I have found for me that when I shoot a recurve with a lighter arrow, the release is more abrupt and much harder to hold steady once the release is made. I had a Palmer recurve that shot GT 3555, and 4560 heritage arrows very well, but when I tried to shoot GT 1535's they flew very well also but my bow arm couldn't handle the recoil after upon release.
Not saying this is your problem, but if it ain't broke, don't fix it.