Quick guide I threw together for fully breeding out a tier, especially when mutations start to slow down. Assumes you have all the breeders unlocked
http://i.imgur.com/3sfztaW.png
Quick bug to report; you can trick teh game into thinking you have more power slots if you equip and unequip the power capacitors, this alowed me to, with some fiddling, get 4 vampire swords equipped.
Of note, is that if you max out yopur iron skin skill, equip the cyber punk armor, and then 4 spiked armor plates (set up is equipable with any weapon set using the previous trick) you are practically untouchable, as your armor points exceed almost every source of damage.