Most trigger assist devices don't play well with DA revolvers, because the trigger needs the full power to reset.
After the trigger is pulled, the trigger has to reset the action and a trigger assist device will usually slow the action down to the point where you can't fire it very fast, or to the point the action may not reset at all.
And as a above, the E-Z Pull device doesn't have enough range to operate a DA revolvers trigger, and if you set it up for SA, the trigger and action couldn't reset at all.
In revolvers, the lighter the springs (or an with an assist device) the slower the gun is to fire. This is why speed shooters like Jerry Miculek often install STRONGER springs.
Clearly, the E-Z Pull is designed for use on rifles and shotguns, not DA revolvers, or any handgun as far as I can see.