Well here is the update after yesterday's enjoyable day at the range.
A few facts and figures:
- Pistol how has 1,120 flawless rounds through it, with 0 FTF or FTE issues caused by the gun (I've caused a couple). I've noticed the feed ramp is getting polished, there is a burnishing on the slide rails and the trigger (Apex Polymer Trigger and DCAEK) is wearing in nicely. The pistol now has a satisfying mechanical "clack clack" action, and 'feels' like a mechanism that is of a whole (Being an engineer, I have a weakness for machinery.)
Still enjoying the Trijicon HD Yellow sights as well, I find the Yellow front easy to pick up. I see them glowing at me from the nightstand in dim light at night, and it is very comforting.
- I've now logged 2,200 rounds of 9mm since last June, including the rental M&P I shot extensively before purchasing mine, and several other 9mm rental guns (Glock 19, H&K USP Compact, Beretta Storm, SigSauer, etc.)
To the grip issue: I replaced the L grip with the S and shot the 100 rounds with a Pachmayr Slip on grip Saturday. I did not like it. I bought it for a few bucks off eBay, as an option against the Talon stick-on grip which had peeled off the back. The Pachmayr grip slides on well, and appears to fit ok. I just did not end up liking the "squishy" feel of the silicone rubber in my hand, seemed like the pistol moved a bit more. I may try the Pachmayr grip again but will likely sell it on. It may be an option for those who like it, I am just not sure it is for me.
I am still on the look out for a size M grip (recall I gave mine away to a forum friend, they appear to be out of stock everywhere) because I think that is the size for me.
- Ammo: Still shooting Freedom Munitions 124 gr FMJ RN new, about $67 for 250 rounds. My future SD ammo is likely Speer Gold Dot 124+p, I want to have the felt recoil of my SD ammo ($$$) be about the same as my practice ammo ($). I like the feel of the 124 bullet vs. the 115. It just feels more "solid". Hard to explain.
- POI: So, my point of impact is now moving, relative to the last few months. I noticed that my tutor target is now indicating "Improper Trigger Placement" from "Jerking the Trigger".
Meaning that, for a lefty, instead of shooting low and away, I'm not shooting high and right. Same gun, no adjustments.
I'm astonished (ok, well not really) that simple things like grip size and experience can affect POI so much.
(Rastoff - I peeled off the skateboard tape on the slide -- you are right, it was not needed, and was causing me to place my thumb there. No tape = no thumbs.

)
Reference the numbers, and the photo above, I was consistently 2" high and right on the day. So, on the last group of 10, I moved the POA 2" left, and was rewarded with a group of shots that covered that lower middle center dot.
For this group also, I practiced with a very firm grip, and pressed the trigger to the break, relaxed and started to breathe out, so when it fired, it fired. At some point then, the shot occurred. I think this helped with the smaller (approx 2") group size here on this run.
While I have some to go with continuing to practice dry presses at home, I feel a lot better about aiming and the resulting impacts.
My wife has given me a present for Father's Day of a credit towards some personal 1:1 instruction training at the range. I have options of either some time with an instructor at FFA or there is a Basic Action Pistol course down at the Wyoming Antelope Club near me I might check out. Certainly at this point, I recognize the need to get some help. That way, once I get some proper training, I can practice more effectively.