You could also add the Flameheart Bracers Though you will have to decide if the extra fire resist is worth the likely serious stepdown in other stats. The Infernoweave Gloves would likely be a better choice over the flameheart for the stamina.
Resistance caps at 365, I believe, so assuming you have a pally aura, the four pieces from badges (which you have) the only other thing you are going to need is at least two dedicated healers. I'm not sure if the felhunter buff is still bugged (it was not stacking at the time we first attempted him and in the last month we have approached this fight with casual abandon.) Our tanking warlock has just over 16k hit points in this gear buffed and with two sets of druid HoT's constantly ticking on him, one druid chain HTing and a pally FoLing his tush off it is occasionally very close if he gets two successive 10k bursts on him with the debuff and DoT. Make yourself a cookie and soul stoning yourself isn't a bad idea. ;) It did not help that our best healers lost a few hundred +heal each as well due to also being in FR gear - which helped us emmensely.
Those bracers can be bought off the AH for cheap, so you can take them and decide if you need them or not. I don't remember what our warlock decided - we wiped several times the first night we came to him and I remember that a few times it was due to the 'lock not being able to pick him up fast enough(dpsers gotta be careful there - making it an endurance fight, in spite of the enrage timer). We overcame this by having a hunter MD to the warlock at every transition. When we do not, we inevitably lose people, and while that is no longer always a wipe by any means, it certainly doesn't help.
Best of luck!
Resistance caps at 365, I believe, so assuming you have a pally aura, the four pieces from badges (which you have) the only other thing you are going to need is at least two dedicated healers. I'm not sure if the felhunter buff is still bugged (it was not stacking at the time we first attempted him and in the last month we have approached this fight with casual abandon.) Our tanking warlock has just over 16k hit points in this gear buffed and with two sets of druid HoT's constantly ticking on him, one druid chain HTing and a pally FoLing his tush off it is occasionally very close if he gets two successive 10k bursts on him with the debuff and DoT. Make yourself a cookie and soul stoning yourself isn't a bad idea. ;) It did not help that our best healers lost a few hundred +heal each as well due to also being in FR gear - which helped us emmensely.
Those bracers can be bought off the AH for cheap, so you can take them and decide if you need them or not. I don't remember what our warlock decided - we wiped several times the first night we came to him and I remember that a few times it was due to the 'lock not being able to pick him up fast enough(dpsers gotta be careful there - making it an endurance fight, in spite of the enrage timer). We overcame this by having a hunter MD to the warlock at every transition. When we do not, we inevitably lose people, and while that is no longer always a wipe by any means, it certainly doesn't help.
Best of luck!