Not really any mods that ive seen but a console command altho it has the effect of making your punches as a human form over powered too QQ
You could try mess about with it if you like,,,
player.forceav UnarmedDamage 100
Replace the 100 with what ever number fits your needs / want Also using the ForceAv comand rather then SetAv should stop it from reverting to its default every time you transform ....