For lvl'ing i find its imo best to instance grind alot, mainly because i dont wanna do collection Q and because i want to save all
my Q's for when im to high or low do do a certain instance

FX: im only boxing 4 chars, at 44 i could do ZF alone with my chars, ive grinded ZF alot and im now lvl 50 with all my chars/toons. next
step for me is to do Sunken temple grinding, but i figure im first able to solo it at lvl 52-53'ish so here all my saved Q's come in