It is definitely faster to lean instead of move from behind a barricade. The price you pay is poor positioning which at 20 yards on the clock will not be forgiving of any error. The best thing to do, in my opinion, is get back from it- way back. Targets will be more easily visible and you stance more certain than if one hugs the barricade
Tried way back today. It definitely feels better, and maybe also any temptation to bring your muzzle up going side to side is likely diminished.
Thanks !!