I think you hit on an important point there. I get master grip the way I do, I think largely because of how tightly the gun is held to my body. There is a lot more room to get the thumb between the gun and body with an OWB holster.
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you use the Spencers keeper still correct? It's pretty similar to the JM AIWB I use with the wedge so that makes a ton of sense. I'm able to conceal a big ole pistol because of how tightly the grip is pushed into the body. I'm just a lowly noob and been watching many a youtube video on draw, and grip. I couldn't get the thumb in between the body to work, because there just isn't the space with how tight the gun is pressed in. Once I modified my draw it has allowed me to get much stronger master grip each time.
Yep Nimitz87, totally agree with what you say there, and I am still using the Keepers.
I go for a full grip and try not to flub it.
I think this is the best video I have of my draw.
https://youtu.be/5VKgEwAY1Y8
I've definitely pulled some hair if I don't wear a wife beater. I also lift in wife beaters and have nice grease stains right there where I carry. My wife hates them;)