I pretty much only shoot revolvers as well.

I have used what I understood was called the Miculek "Death Grip" for years shooting silhouette out to a 100yds +. It seems to look the same as the Weaver Grip.

In the Death Grip, you squeeze the left thumb with authority over the right thumb which allows the right thumb to be held securely in place, but RELAXED.

I started using it because it allowed me to shoot a 44mag double action (DA) securely, but keep my right hand trigger finger relaxed. For me, it was difficult to Gently squeeze the trigger if the rest of my hand was tight.

Even in single action, the death grip gives me better trigger control.
Tight left hand; loose right hand.

Try it. If it's good enough for Jerry to give it a name, the grip might work for you too.

Prescut