As I mentioned before, it might be qorth a try, but in the end, I don’t find it worth the loss of the other stats. You just gain 5% RR by taking Viper, which still is considerable, but the loss of OA & Crit Damage is harsh for this build. You lack both in the end, even with Hawk.
I quote Zantai in this matter:
Nearly all my Relic Blueprints dropped from Treasure Troves and Fabius runs with my first char. After you have headed into Ultimate and the Relic didn’t drop after you’ve killed Kilrian, just do Treasure Trove runs in the Arkovian Undercity. Down there is a guaranteed Treasure Trove to spawn. Plus a chance to fight Moosilauke.