That must be it, GB...
As I look at the CTC site, the SW J Frame models are on the front of the grip and taking the grip cannot help but depress the activator with the "middle" of the middle finger.
On our Auto's (other than the 203 for the MK II), it is a slightly larger button on each side of the grip but not in the middle of the grip that the "tip" of the middle finger must find and depress it simultaneously as you squeeze the trigger... a double squeeze...it's not terribly cumbersome but I'd like to see a longer (up an down the grip) button like the other poster mentioned on his granddaughters Mark II model 203...
Better yet, if the activators were larger, even the pressure from the palm side of your hand could assist in the depression of the button (plate) leaving the finger tip an "if you get to it, OK, if not, the dot's still there" issue...Less time thinking about getting to the button and more time getting down to bidness... fraction of a second here, fraction of a second there in the warp speed of a "situation".