You will not like it, but … who said that phys should wear physical legs or that a heat should have legs heat …? How many times do you use your legs as a weapon?
Sometimes trying other style of legs can help a lot the build. This energy cart is very light and allowed me to place another HP plate, gained about 30 HP more and also advances 3 places.
Sometimes paws are chosen for weight or mobility, rather than for damage they can do. For damage, weapons are already there.