Still grinding on lesser mobs when soloing

[kinokunya]

Hi guys I'm a mage user here, from what I read in the Archer discussions, they can inflict 1/3 to 2/3 of a mob's health before it reaches them, which is about the same as what I do. I will suffer at least one hit even when fighting green mobs. On average it takes 4 consecutive spells for me (magic missile lv1, magic missile lv1, fire bolt lv1, magic missile lv4) to pin Grave robbers down (their names are grey to me, I'm already lv28), which I think is quite weak for a lv28 mage.

My Skill points go to:
Magic missile skill empower cooldown+5, damage+3 (going to max dmg also)
Fire bolt skill empower damage +5

Recently I added 2 points to SPR, with all the previous points into INT. I am using a [+7 SPR] ring and [+6 INT +6 SPR] ring from the Marlone Quest, with 1% crit earring. As I thought the SPRs and crit% i got from the accessories will balance off with the INT I've been putting into my Priscillia.

Is this the norm? I'm using a +5 lvl20 merchant wand by the way.