Another addition, for One Punch Troll.
If you go with the interpretation that multiple pairs of striking calluses stack, and that you can only have one striking callus per limb...
Surge. Shiva arms, times two. You have four more arms, for four more striking calluses, for an additional +2P.
And! If you turn into a ghoul, you get a higher strength cap.
Time to go full-on silly!
This brings our omega ultimate killer super death punch to...
Cyclops (11 Str baseline cap)
Exceptional Attribute, Genetic Optimization, and the surge power to boost your strength cap (+3 strength cap, now 14)
Ghoul! (+3 strength cap, now 17)
Any means of boosting your strength to your augmented limit (strength 21)
Bone Lacing/Bone Density 4 (+3P, damage is now 24P)
Critical Strike (+1P, now 25P)
Shiva Arms x2, with Striking Calluses x8 (+4P, now 29P)
Penetrating Strike 4 (now 29P/-4)
If you rule ghoul troll stats override cyclops stats instead of being some additive thing, then 28P/-4.
Sadly, ursine shapeshifters can't seem to become infected by any stock template, so it'd be the realm of, "Your GM really wants you to have a 'fun' run." Otherwise, you could have a six-armed zombie bear dude hitting people really hard in the face for 30P/-4.
Now, the GM takes that six-armed cyclops ghoul throwing 29P/-4 punches and makes it a toxic adept punching you in the face with radiation damage.