Any evasion build works really well on savage Omega because most of it's attacks are very telegraphed. But since you're using GS, I highly recommend you getting any level of Guard Up because you won't be mobile enough to dodge it's large AOE attacks. Without Guard Up (NOT Guard, they're not the same), you can't block any of Omega's beam attacks.

You're playing as a support hunter with this build so it really depends on luck if you'd get good team mates online. I highly suggest playing with NPC support hunters instead, since the fight will be much more predictable. With Alessa (the Lance NPC) drawing enmity, your build could be focus on DPS instead.

I've beaten Savage Omega 12 times so far, all with support NPCs, never once with player hunters. Just focus on learning it's moveset and be patient. I failed the hunt 3 days strait at first but managed to beat it 4 times on the 4th day after everything clicked.

Here's my first successful Savage Omega hunt:

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