Gamepads in general has too many actions per finger IMO and the same layout has been used for 20 years now. It's like playing a bass guitar (or any instrument) with thumbs and index fingers only. Only advantage is those analog inputs but they have no place in FPS where you have to relay on accuracy instead or cone of fire. "Sniping" in
Spunkgargleweewee is just another firefight in ARMA but you have to be faster and more precise.
For me: Gamepad is my last option for input method because I own a standard keyboard, excellent gaming mouse (
G500s, won't switch!) racing wheel, HOTAS, head tracker, and a gamepad.
I beated Dark Souls II with keyb + mouse and currently I'm on DS III. I just felt too clumsy with keypad and after switch thy way was only up and forward.
For original poster: Keep working with your muscle memory and customize your keybindings. Lear which actions are important, there's tree categories: Priority; actions that you use mostly. Bind them so you don't have to move your hand to reach all of them. occasional commands. next to priority or via modifiers (shift , alt , control) or double tap. Special command: low priority, bind only what you use.
A good rule is to avoid to bind too many priority keys to one finger.
Also think about to invest to a proper gaming mouse with extra buttons and good macro software. 5 buttons and a wheel is current standard for gaming. This helps to spread the commands to your right had fingers.
Here's my list of priority keys in ARMA: may not work with you because I use pedals to lean and head tracker to look around.
WASD for movement (w+w to sprint)
Z X C for stances
Q: ACE interact (+shift to self interact)
E: default action
R: Reload
F: Fire mode (+shift for grenade type)
alt+ WASD stance adjust
spacebar: rest weapon
V: step over
<: Teamspeak PPT (Scandic keyboard)
shift to walking
On Mouse:
m1: Fire (+shift to zoom in)
m2: Hold breath
mwheel click use action (+shift zoom out
mwheel up/down: action menu up/down
upper thumb: aim weapon (+shift switch optics)
lower thumb: cancel (close action menu)
mid thumb: Teamspeak ppt
mwheel left: SR radio
mwheel right: LR radio