Ok, thanks for your opinions, guys.
I do also have a Montefeltro in 20ga 26" in wood which is 2.5kg only. This shotgun fits me best, I had to order that D plate then cast myself a 1/2" spacer to make a proper fit. Last Sunday I had two shots and two kills: a woodcock was typical trap shooting situation, then a rock dove passing by at 30..35 yds. Lightweight gun, quick swing and proper fit. As of now it is my favorite.
I also have an a400 Xtreme Unico - good shotgun, but front heavy. I can not tell it is my favorite.
So, long story short, it looks like there is no impressions on the "Benelli Ethos BE.S.T." yet. OK.