Re-reporting just in case. Empire Longbow partially charged shots deal less damage to berserker armour than uncharged shots. This makes no sense. This bug is also very old, possibly as old as launch. I’ve seen an acknowledged bug thread from Nov 2018 and kerilian’s longbow had an identical issue that is already fixed.
Since weapons only get changed during these infrequent betas you should try to take care of this bug now, or we’ll be waiting another year.