I've redone this about half a dozen times, forgive me if it's a bit disjointed.
In regards to the Hk LEM, it works for me. I also shoot a fair amount. Over the last 9ish years of shooting LEM, I have about 50k logged. In general, the longest time between shooting is a week. With that said, I don't know if it's "hard" to stay proficient, because I shoot frequently.
For me, shooting fast <.25 is not difficult, I also could care less about splits. Every feral animal I have put down was not in the same spot .15 seconds prior. Only hits count, right?
Currently in good shape to win a bowling pin league against users of $2k guns. Why? Because they can't hit a bowling pin at 9 yards under pressure. I'm hitting faster with a sub compact LEM carry gun. Again, it works for me, I have confidence in it and I am mildly proficient with it. Now, the other shooters may have some issues, be it physical, visual, mental focus, etc. that prevent them from shooting better. However, in my opinion, when you invest heavily (time, money, energy,) into an activity, it shows a desire to be good. It doesn't matter that you have a 2lb trigger and can split .12 if you can't hit the target. The lack of ability is especially enlightening after the virtues of their new trigger shape, spring job, action enhancement, low power factor ammo, etc. have been shared with me. Guess it's not the gun.
Buy a shot timer and a stack of NRA B8c, and log everything. Choose standard drills and compare.
Also you asked, so here are my reasons for sticking with Hk and LEM:
Maintenance schedule:
-25k on recoil assembly
-passed the 2k challenge multiple times
Stepped chamber:
-tolerance for filth
-tolerance for slightly out of spec rounds
-helps center the round in the chamber
Mag reliability:
-never worn out a mag
-never scrapped a mag
Accuracy:
Lockup consistency
- no first round flier syndrome
- Generally can shoot >95pts on a B8 at 25 yards freestyle using irons.
LEM:
- allows hammer block
- ability to see my trigger press without tactile feedback. For example, when fingers are gloved /cold / numb.
Paddle release.
Grip texture is sufficient for CC.
Ambi Slide release size.
P2000sk specific:
-Front strap bump acts as "recoil lug" for ME.
-Grip length works well AIWB for my 28 inch waist.
- Large trigger guard allows for gloves.
-Size allows for carry under heavy, bulky garments.