I also have the .22 MAG mini.....
It took me many-many-many trips to the range to finally shoot what could be called identifiable "groups" with the mini.
The best modification I did was to order the rubber over-sized grips for it. Now, the gun fits in my large hands like a glove and I can now rapidly cock and fire with much greater control and accuracy.
I shoot it strictly one-handed and practice at 7 yards to "up close and personal range." I practice by actually drawing from the pocket, acquiring the target and firing repeatedly until the cylinder is empty. With the oversized grip, I squeeze the trigger with the middle segment of my trigger finger and it gives an almost ideal alignment. My accuracy from one year ago to the replacement grips has been astonishing - a quantum leap,
In summary, I would really take a close look at NAA's replacement oversize rubber grips for your mini. Not only do they make the gun fit your hand better but with a small Uncle Mike's soft flexible pocket holster, it is still infinitely concealable