Exotic focusing is a joke rn. It's expensive and gives crap rolls. I just spent 8 ascendent shards and 4 exotic shards focusing Cadmus ridge lancecap with a Resilience mod and the stats was in everything but resilience. I can't remember I ever got a good roll from focusing.
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I hope you are aware that some exotics have default intrinsic stat focusing. (Most of the time this runs COUNTER to the stat you want) And that stat focusing provides a MINIMUM of 10 in the stat you want.