Ships & Modules

I have a basic fit for my Machariel for Incursions, but I can never decide the best way to use my extra midslots and open high slot. Here's the current fit.
Lows:
4 x Republic Gyros
1 DCU
2 x Tracking Enhancer IIs
Med:
2 x Invulnerable II
1 x EM Ward II
-- extra mid
-- extra mid
High
7x 800mm autocannon
-- extra high slot
Mods:
Therm Resistent
Shield Extend
Damage boost

What would be the best way to use the 2 extra mids? I thinking 2 webbers, or 2 target painters, or 2 tracking computuers, or a combination of either, but can't tell which one would be best for boosting applied DPS. The webbers are nice, but they wouldn't be helpful for targets out of range. The TP would boost DPS for all targets at all ranges, but for turret DPS, I'm not sure whether sig radius is that more of a boost to DPS. Tracking enhancing is nice for close targets, but not so much a boost for distant ones. Any advice?

Also, any advice on the extra high slot? A Drone link augmentor would be easy to fit, or I could put an energery transfer array.

Thanks

I see. Thanks. I don't generally stray to far from the sheild rep, so the AB wouldn't do much for me. Do you think 2 tracking computers would be better?

AB's are useful for applying damage (getting to optimal n staying there), and also for mitigating incoming damage (mach's are fast and have a tiny sig, might as well play to its strengths)