We never used FR gear for Rag, maybe 1 or 2 pieces only. If DPS dropped enough to where you had trouble with killing the sons then things went to shit. During the main phases it was kind of a joke.
Were you pursing him before his first kill? It was pretty common thinking at the time that your melee DPS wanted like 300+ FR simply to free up the healers from having to worry about them outside of a HoT here or there. In fact the way I made most of my money early on was selling fires to craft FR gear.