As an alternative to this - I think we bogey guys can try too much of this for our own good sometimes. In my observation, the fancier and more technical folks at this level try to get, the less effective the outcome. Unless someone is a REALLY consistent chipper, it might be a good idea to go with: 2 clubs, one ball position, one level of face openness, one level of choking down, etc. Then once you are really good at that - add something.
The two clubs are so you can make two different shots. One for closer pins with less green and one for when you have more green. Everything else being the same offers you 2 things. 1) a chance to actually become really reliable with the shot 2) a chance to actually develop an expectation of what the ball will do.
When you add variables of several clubs, each with different ball positions, then each combination of those with different face angles, etc etc etc - the number of variables and outcomes is tremendous. And none of them matter if you mishit it because you've been varying the ball position. The small difference in outcomes due to all these variables is small potatoes on the scorecard compared to 1) making great contact time after time and 2) knowing how far the ball is going to fly, check and roll.
I don't believe bogey golfers have poor performance around the greens because they are consistently hitting high quality shots but simply picked the wrong ball position or choked down the wrong length. In my observation, we perform poorly because we mishit the ball, skull it across the green, fat it into a bunker, etc. I'd think reducing variables as opposed to adding them would help with decreasing the score-killing mishits.
I feel I'll catch flack for this - but it seems logical to me.
I may be an exception to this. I focused on short game from the start to compensate for lack of distance. So, I don't skull, duff around green. Now, I can get balls consistently out from any kind of bunker. For chipping & pitching, I have same swing length but use different club for varying length (e.g, 15 yards for LW, 20 for SW, 25 for GW1, 30 for GW2, 35 PW, 40 9i, ..., ). If needed (too lazy to bring right club from cart), I will use whatever club I had in my hand but I would have less confidence with the ensuing shot.