i need some help about sp farming at panons

[mahumps]

i know a lot of ppl been asking for this help, but all i see is their pure int or hybrid int. Now i'm a pure str bow atm, after farming i'm ganna shift to blade so i need a lot of sp.
Someone told me to farm at penons, so penons are lvl 54 this is my question. Should i farm at penons lvl 54 or lvl 52:

at lvl 52 i need to get more damage to kill the penon faster coz it's orange to me, but 9 gap+GT+higher lvl monster=good sp.
at lvl 54 new fire imbue book 3 max 2nd book (inti devil and combo) i got 2 skills only.
i can't do mobbing coz i don't have that AOE skill, i only got 1st and 2nd skills from bow.