Same here.Don't overthink it. Try them all and use the one that feels most comfortable to you.
Throw the other ones in a drawer somewhere and forget about them.
I use no backstrap on my Gen 5 Glocks and the smallest backstrap on my M&Ps.
Easy peasy, lemon squeezy.
I think this is good advice. Other than a pocket gun like a J-Frame or the P365/Hellcat, I really have not found handguns that are "too small" for my hand. I'm not 6'2" but I have German hands which tend to run a little larger than my 5' 11", 170 lb frame would have.Some have suggested starting large and working down.
I suggest starting with "none" if you can, or the smallest if you must fit a panel. I think that the end-user will find the best fit more quickly this way (IE - smaller grips will probably be better anyhow), so might as well start on that end of the line.
For reference: I'm 6'2" tall. I have proportional hands to my size. They're not gargantuan hands - and they're actually probably smaller now that I've not been doing manual labor as a job for a long time. Continuing - my hands are not small, either. Smaller panels work better for me.
With hand anatomy, when you create a gripping motion, you are contracting lots of "stuff". Muscles (relatively few, actually), tendons, ligaments, etc. Contracted "stuff" often times means that all that "stuff" is now chubbier. What happens when you contract your bicep muscles? They pop up and out and get big, right? Same principle applies when grasping (flexing) the hand.
One of the big culprits are the relatively large muscles that help articulate the thumb inward. When this flexes, it takes up more space.
So - in order to have enough space for your hand to do what hands need to do, there should probably be less of whatever it is being grasped in order for the whole system to work together better.
That said - a person can absolutely adapt and overcome systems that are not ideal. I once read a story about a new cop who was issued a 3rd Gen S&W auto as a duty gun. Huge grip, long reach to the trigger. Dude had a HORRIBLE time shooting it. But he spent hundreds of his own dollars and hundreds of his own hours shooting and training his hands to shoot that gun better.
We now have the luxury of accelerating that learning curve with all these grip configurations.
My advice, as a nobody and as an expert in nothing, is to start small and work upwards. I also suggest vetting all of the above because I didn't sleep at a Holiday Inn Express last night.