Need help building a Saryn Prime setup.

[Taka]

I'm relatively new, only MR 6, and my Saryn is Rank 30, 74 capacity max. I am wanting to get a setup with either base or increased duration, decent efficiency, high range, and high +184-200+ power. This is the best I could come up with with the mods I have, and the other mods I have available that I feel would contribute to this are in the bottom of the image. I would like to get mods like overextend and primed continuity, but I am having trouble getting useful mods like those. If I could get advice or assistance on this setup, I would be pretty grateful.
Yes, I am aware of the incorrect polarization on my setup, I have a forma being built to fix it if need be.

http://imgur.com/gecJuyz