Guys Fell Cleave burns are not that difficult...
I duo them pretty much weekly...
I have a pure -pdt build. I generally take mobs that are DC or lower but i do go higher when there are none. My wife takes her RDM with 5/5 phalanx and i use heavens, VV and RR(tougher mobs I use MC) atmas. I have no problem killing whatever is in front of me and i almost never drop below 99% HP.
Just keep phalanx on and you should almost always get hit for 0.
95war/47sam
Pop the blue chests for ISL's to reset your 2hr and use it every pull u can.
I pull myself, takes about 1 minute longer per pull than it does a RDM or PLD. But less gil to spend on RDM -pdt gear and less to split the profits with and still stack an easy 400k xp / hour.
********************************************************* EDIT ******************************************
I started out not using berserk or agressor... however with mobs hitting for 0... It is a good idea ^^ make them hit you more often.
Your target pdt range is 1hp per hit. with mounted champion its like your not getting hit at all.
Now I use berserk and aggressor at start of every FC after pull, assuming i got the ISL.
With this setup I can kill an entire pull of whatever mob i choose with 2-3 ws's. Pull, retalliate, hasso, berserk, agressor, warcry, sek, 2hr, meditate, FC, FC, 2-3 secs later, FC, they are all dead (Save that one *** that likes to evade the FC!) ^^
Happy Hunting!