Hey folks, sorry for the late reply. The tips I got when looking for help with shooting my HK was,
"He is correct. It takes a couple of hundred rounds to get used to the LEM (aka V7) trigger. I assume that you have never shot the LEM trigger before? The proper way to aim, is to line up your sight with the target, pull back the trigger until you hit the break point, line up the sights with the target, then pull the trigger. Do not release the trigger all the way after the shot, but instead, release it far enough until it resets, then line up the sights, and pull again. That's, in a nutshell, is how you shoot the LEM trigger.
Once you're used to the LEM trigger, your groups will improve."
Following those steps about LEM trigger control with hours UPON hours of dry fire practice at a post-it note on the living room wall with a dime on the slide followed by 400 rounds of 185 Federals is what helped me improve. It was ALL contributed to poor trigger control on my end!
As for stance, it was Isosceles. My shoulders were barely rolled and the grip was thumbs forward. FWIW, with MY grip neither of my thumbs touch any part of the firearm. I keep them pulled away about .25".
