as for techniques, this may be somewhat irrelevant, but i have found it effective, to group a wizard with my berzerker, have the wizard run farm.mac, but dont set a radius or a zradius, and then on the zerker, i just run pocketfarm. the wizard will usually autoreact to any mobs that enter combat with the zerker, and while it wont explicity follow the berserker, anytime the zerker enters combat, the wiz usually willl autonav to the enemy mob. you can use the Follow Me option on the zerker, but if you do, try to keep your cast times under 3.5 seconds on wizard, or you will get interrupted more than you will cast.
also, for farming 70-80, in sunderock, near the north end, there are some steam drakes (i think, cant remember the explicit name) around level 69-72, they deal mostly magic cold damage, such as ice spear of solist. if you have a some cold resist or magic resist buffs or gear, it makes for an easy farm. finally got one of my zerkers going well up there, just loaded him with resistances until the ice spear dealt poo for damage. if they run out of mana they melee (against a 72 zerker wearing full elegant/elaborate) around 800dmg. considerably more damage than the resisted cold spells, but if you kill them before they run out of mana, it is not a problem.