Free: Contests & Raffles.
Not trying to be an internet jerk but try taking it off the trigger guard, it serves no purpose putting it there. In fact you will be much more capable handling recoil with it under the triggerguard. If you are putting pressure on the trigger guard, hooking it with your week hand, it can be one reason why you might be pulling shots left (if you are right handed) or push it, taking it to the right. Putting it under the trigger guard will also give you more "surface area" on the grip where as right now you only have three fingers of your off-hand on the grip. Don't just believe me though, try using a timer and shoot both ways and watch your splits (time between shots). Fire a magazine or a cylinder into a backstop without looking at the sights, just look over the top and pull the trigger as fast as you can when the pistol returns from recoil using the method that you use right now. Then try putting your index finger under the trigger guard and put the meaty part of your off-had in contact as much as you can with the grip and squeeze as much as you can with your off-hand, just until your sights start to wobble. If you don't have access to a shot timer, look up "USPSA Timer" or "ISPC Timer" as an app on your phone, you will find a free one there.