Screw it. I put the Cannondale BB30 crank back on, I'll just have to get a new Stages power meter for it. It'll wind up costing me a little more but the whole thing will be lighter, stiffer, I can finally switch to mid-compact rings (110bcd), and I won't have to mess with adapters. Thanks for all your help guys. Hopefully others will read this in the future when they will inevitably need the same help.
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2014 Cannondale SuperSix EVO 2
2019 Salsa Warbird