No weapon skills because you need to make choices, 300 masterys isnt all that much..
Pure INT is supposed to use magic attacks so eventually its best to get ice/fire/light..
As for your concern about using s/s or spear..
I myself have the same build as you are planning to get right now (still farming to get it all skills maxed out though)..
But i use BOTH spear and s/s for pvp (just switch to s/s when your snow shield is gone, or when its 2vs1 or more)
For grinding i use s/s because its easier to survive that way and you should still be able to 2hit mobs that are like 5lvls higher then yourself..
As for farming the amount of SP you need, dont make the same mistake i made, just farm it all at lower lvls and get powerfarmed instead of struggling to get it by yourself..
Even on a 9gap it takes very long to get all the SP you need if your not getting powerfarmed

Hope this helps a bit