no, dont try to kill red mobs. u will kill them super slow, and waste hp/mp pots aswell. as the guy before me said, kill mobs that u can 2-3 skill. or u can kill mobs that are 2-3 lvls lower than u. anyway, try to kill mobs that u kill fast. and after 43 (when u have AOE kd and sword dance), u should aoe grind, spawning mobs at u, and killing them all.
a usually grinding tactic for a blader might be-
lvl 14 skill, 4 combo, 5 combo
lvl 14 skill, kd, stab
lvl 14 skill, 5 combo, kd
lvl 14 skill, 5 combo, smashing series
the lvl 14 skill can be replaced with the lvl 31 skill (dont know their names lol

).