I was under the impression that each rank of hq +1/2/3 increased the Star'd stat by 10%. Not sure if anyone has any solid testing on anything with HQ but maybe there are caps set or maybe weapons don't play by the same rule as armor.
I equip vintage gusarme +1 (LNC weapon) I'm rank 50 so I get the full stat gain. Base stat listed is 161 attack. My attack with no other gear is 170. So I'm getting +9 attack for the HQ+1 or roughly 5% gain.
My question is do weapons gain 5% for hq which is different then armor or did they adjust hq stat gains across the board.