Have you tried the Dunlop Ultex 1.14 mm? If you don’t like the thicker picks, this may be a good alternative without sacrificing the tone you’d get with a thicker pick. They’re still stiff enough to give good control too and they are plenty cheap. I’ll send you a couple if you’d like to try one or maybe you already have tried them.
Alex mentioned the Max-Grips in the same thickness. I’m not sure what those are, but that may be a good alternative too. I’ll have to look them up.