A question about SP Farming at high levels...

[Deadly EYez]

Hello.
I am currenty level 49 with bicheon 48 fire 38 lighting 27 cold 30
And i really need to farm sp.
what should i do? i really have leaving a gap and going with it..
I was thinking about hitting level 51 ( to get the new chains as they help in pve) then keep going with 0 lvl gap without learning skills just raising my bicheon mastery.
till i hit 9 levels gap then ill use the item mall scrolls to delete my mastries back to level 51.
and farm sp like crazy..
Is there a good place to farm sp at level 60?
or do you think i should do that at level 64 as ill get a new blade ....
Thanks..
Oh and i am full str =P