Got it. Earlier in this thread @C.M. Jones mentioned your grip. This is the key, you have trained yourself to grip the sticks too tightly and simply need to loosen up. Try a few different sizes of sticks and experiment with where you hold them.Ah, but I'm used to working drums with no bounce (my e-kit) - it's controlling the bounce of a real drum that my left hand is struggling with.
Being a rocker I hold sticks really close to the end most of the time, but if I am playing something requiring more finesse or softer I’ll choke up some.
But I also subconsciously am continuously adjusting my grips while playing, basically ‘rolling’ the sticks in each hand. Your grip should be so loose that you are doing the same thing. Almost to the point of dropping them. Relax.