Nasus does not need more damage -- he needs to live long enough to apply it
Nasus is currently getting damage buffs. Nasus already deals plenty of damage (easily outdamaging similar champions like Sion, Jax, etc) - his issue is that he rarely gets to apply that damage against the multitude of hyper mobile or cc heavy high burst damage champions currently in meta.
Is your intention really to have him able to go toe to toe with a
or
in the early game off base stats alone? Isn't he supposed to be a brawler / juggernaut?