No...But this is clearly not the case. From your explanation a human with 109 strength should have the same experience as an alvarian with 89 strength and the clades. Which is not the case. A human with 109 str that pulls a 108 bow has stamina drain equal to stamina gain resulting in the stamina bar being frozen. An alvarian does not lose the penalty for having a bow above their strength completely and manifests more stamina drain than gain despite having increased stamina gain while standing still.
Thats what im trying to explain, the clade does NOT work like it adds +20 strength to your character, it ONLY removes the penalty for using bows up to +20 strength above your characters strength.