Criticals are always a problem seems. You bring out more anti-critical perks while at the same time introducing Another perk for sneaking, which enables brute force damage via Criticals yet again...
As Jovanka has said, it requires a nerf, somehow. I miss the Armor penalties while sneaking, too, if they are gone( not sure, heard someone say that they were wearing CA while sneaked). As well, running(while remaining stealthed) should give a penalty. Or movement in general( a lower penalty for walking, higher for running). Just ideas, I am not an expert on the subject. Seen some of it, though, and it is ridiculous so far.