It's more likely you need to adjust your grip and stance. You should grip as high as humanly possible to be in line with the bore. If you could be in line with the bore the recoil would push straight back with no muzzle flip. We want to get as close to that as we can. So high grip.
Also use the isosceles position. A lot of people find the Weaver stance more comfortable but the isosceles aligns the bones so you need less muscle strength to shoot. You're relying on major muscles (deltoids and pectorals) to crush into the gun and push it forward, not minor muscles in the forearm.
If you still want stronger grip I learned long ago from wrestlers to spend a little time each day squeezing an old tennis ball. It's a pretty good grip workout if you do it for 15 minutes a day on each hand.
I will look for a tennis ball. I dont do much with my upper body, so I do not likely have much strength in those major muscles. I could join a gym and go to some of the machines, I did that a bit years ago, you know with zero or 5 lbs settings, you build up. Wait, maybe I should just take time each day to hold my pistol out, in the correct position ?
I do think I have an inconsistent grip, I do face forward, straight on, usually, when shooting, not when peaking around a barrel doing action of course. But when facing a target, I definitely have a "passive" stance compared to somes agressive stances. I was thinking I should get my hand position and sight picture to be consistent first ? I literally see things different, not consistently when getting a site picture, I like to have one eye closed, which I do with a rifle, but I think I remember that I should have both open ?
I have tried looking up hand position, and it did show my left thumb should be straight forward, and that given where my "grouping" is that I likely do not have pressure on the left hand countering the right enough, so I have done some practice making sure to put pressure there. The hand position pictures I saw it seemed I wasnt matching, but maybe close enough.
What might be helpful is knowing which web site people are the "right ones" for good information, there is alot out there.
Yesterday, I was nervous and a bit wild at first, settled down and hit in the 8's , then when I got tired, started stovepiping, by the end, almost every time and my left wrist hurt. Which was too bad, as last time up was my turn at our 1 at a time action scenario.... I got nervous and cleared my stovepipes, a type 2 problem, using the type 3 method of dropping my magazine, so....I was shortly out of magazines ( I only have 3). There's a good way to die, throw away your ammo....but, luckily old ladies like me arent being ccw heros out in the streets ( but ya never know, if stuck in an active shooter scenario, we would want to save our life) not likely, more likely in a home invasions, but an awkward clearing there would cost time that could kill you, esp since at home there is often just the one mag and you arent carrying around 2 spares. The whole time yesterdy morning was practice clearing of these errors. So now, when I go to the range for the rest of this month, my homework is to practice that some more. You see, I did fine clearing these in the appropriate way on the line, but when under stress, did not evaluate correctly.