So I have a Sigma 40, M&P 40c, and a 22a. Shooting all three by rotating thru has made me better. The Sigma requires a consistent - steady pull to be accurate. The M&P 40c reminds me to lock my wrists. The 22a exposes any flinching. Also, shooting one handed - switching hands - is teaching me a lot as well. Ultimately, its me that needs to improve.
Only perfect practice makes perfect. My methodical analysis - learned from being in manufacturing, engineering, and now sales - has taught me in this real to look at my grip at every point and study analysis charts. I wish I could spend more money and hit the bulls eye, but like any sport - 99% of the time its the person. The money here is ammo, range time, & classes.
Cheers