-25% Evasion? How has it been working for you? I've never been fond of the idea of taking that much extra damage, though it doesn't apply to Shields.
As a Tech, you don't have much Health, but your Shields are much better than any other class. Power Surge/Deflector Regen restore a percentage of your Shields, so you want to focus on them.
+20% Armor defense isn't enough, especially since most high Defense armors have Evasion penalties (being auto-hit devalues Rapid Recharge).
Armor
Chameleon: Good Evasion and high Shields.
Paragon Hazard: Airtight, which protects against Irradiated tiles on Phaedra. Evasion penalty, but the highest bonus Shields on any armor.
Zaika-Style Gown is also good, especially if you went Shields. Excellent bonus Evasion and +10 Accuracy.
Melee Weapon
Custom Shock Gear used to be the go-to. Bonus Hit Rate is somewhat devalued by the addition of Specialized Combatant, but the extra Evasion is always good.
Magma Crusher is probably an upgrade, especially now that the Burn DoT is actually useful. Fight Smarter mitigates the Accuracy penalty.
Ranged Weapon
Hirudo Devourer or
NaN Deconstructor will let you heal if something gets through your Shields. They're also Corrosive, which is a rarely resisisted damage type.
Ice Lance can cause Deep Freeze, which doubles damage from the next Crushing attack (like the CSG or MC above). Deep Freeze is an Aim vs Physique check, modified by the target's Freeze Resist. But it always applies on a Crit.
Accessories
If you went Drone, you'll probably want a Drone Accessory like Tam-Wolf 2.0.
If you went Shields, either
Shield Aug Bracers or
Vintage Zaika Purse.
Light Jetpack is also a possibility. Flying enemies as a Melee attacker are annoying. On the one hand, it's still the best Evasion Accessory in the game, which makes Rapid Recharge more useful. On the other, you can get Wings for that.