What are y’all wanting the concentration save for. For the most part you are better off just divine smiting IMO. Even when you aren’t it’s not like just divine smiting is that far behind.
Many of your best buffs are level 1 spells and it’s no big deal if concentration has a chance to end early on them IMO.
So why worry about the resilient con feat at all?
Haste mostly. Albo recasting buff takeś usually bonus Action that could be just spend on more damage. But my Second proposed build mosty take warcaster just for booming blade. Hence why 14 con is Second build.