Augments are least priority and far down the line. Don't even worry about them unless you got your fingers wrapped around on Heroic quality ones. Those, can actually matter quite a bit.
I had a very good solo crit based build for Kaidan. I used melee weapons, namely Blade/Fist, but you can use any weapons really, just need the right passives:
1. Gear:
Glyphs: 1 Hit glyph on major, rest 75% crit rating 25% crit power. You can also add Penetration into the mix.
Talisman: Head = Health, 1x Major = Heal Rating, Rest = Attack Rating
2. Passives:
Gross Anatomy
Blood Sport
Mad Skills
Sweet Spot (Advantage Me if you have Signet of Thirst)
Brawler
(Any, but whichever that ups your damage to your main weapon, such as Knuckle Down or Hard Impact is preferred)
(Any)
(Optional)
Wrecking Crew (20% Crit Power if you use Strike)
Dark Potency (+ Penetration)
Iron Maiden (If you have decent Penetration go with this instead of Dark Potency)
Advantage Me (Heals, but not nearly as good as Sweet Spot)
One in the Chamber (better against multiple mobs)
Running Circles (works well with Hinder if you're ranged, but mobs quickly gain Hinder immunity so be aware)
Tough Luck (Root every 30 sec)
3. Actives: 1 AE builder, 1 single target builder, consumers for both weapons. For the rest something that will save you in tough spot or allow burst damage. For hammer I really enjoy Full Momentum and Unstoppable Force (Elite).
4. Aux: Whippersnapper is useful to interrupt an ability and saves an active skill slot, which is more important.
I focused on one 1 color AEGIS controller because AE Capacitors that you can equip depends on the highest AEGIS controller level. So for example if you have 1.6 Psychic AEGIS controller and everything else is 1.0, you can equip AE Capacitors QL 6. Those four QL 6 AE Capacitors will help you exponentially. In fact, just having 4 AE Capacitors of any QL should allow you to most of Kaidan missions solo, so imagine what 4x QL 6 AE Capacitors can do for you! Note that Psychic shields seem the most common out of the three.