chest holsters work awesome for this and are your best bet
they center the weight of the handgun, make it super accessible (probably most accessible position), and keep it out of the way of all your straps and you don't feel it under your arm
i have this one, great quality and customer service
the retention adjustment screw will take it from "will almost fall out if upside down" to "can't pull it out without ripping at it too hard" and everything in between
it also comes with spare hardware, the thumbscrew that holds one of the horizontal straps to the holster would come a bit loose from continual movement, so i used some purple loctite on all of them and nothing has moved since
i can easily pull this out when i need to but have taken a fall and it stayed put
these do not have a retention strap, but are custom molded for your exact firearm and you just set how hard you want to have to pull on it to remove
one thing, other people you meet in the woods will give you a slightly wider birth compared to a side holster and they will immediately know you are carrying...it is psychologically more intimidating to them for some reason it seems.....this is good and bad but kept me out of an altercation once with 2
**** that thought i had trespassed on their land because their toothless woman folk lied in order to see the men do something interesting on their behalf