I hear you bro. I was one of the few GAFers who went through the entirity of Act 5 while leveling from 60-70 with nothing but my original level 60 items. DH, roughly 330k dps, Kridershot with maybe about 40% buffs to it via elemental and skill-specific affixes.
It took me maybe 10 minutes and at least 15 tries to beat Urziel (sp?) at maybe level 66 at the time. My 1.5m crits were barely chipping him.
By the time I hit 70, everything was chipping and my 1.5m toughness meant surviving was hard. I made that hit happen, though. I had to tick the difficulty down for Mal to Master after a few runs made it clear it would be simply unrealistic amounts of time to drop him, but I was T1 all the way up to him. With 60 gear. 300k base dmg and just 1.5m toughness.