at least not for 2H ranged no, with purifier you can get both flat damages that you can convert and crit damage (at the expense of less OA, uness you are pierce damage)
wpn damage is ok, look at this [1.1.8.1] Zavageryyy - Elgoloth Ranged Vindicator (SR80) which has like 10% more weapon damage but probably has more than double single target damage compare to your shield break