I would put 1 attack and 1 hp first.
Aegis is not a really strong unit attack wise and its hp isnt particularly high for a prolong harassing....
When harassing with Aegis, NEVER go into MA mode and knock ur target down. Its just a waste of time. Only do it if u find the other team's rock MS trying to melee you. You can also do it when u see rocks just stupidly charging to u and then just shoot them in MA mode (when u do this, dont jump and dont miss! Reason is because u wanna keep ur boost after the shot to move back and then shoot again).