Energy Drain was my lifesaver button as an Infiltrator. The cooldown is far shorter than Geth Shield Boost, and with near every enemy on Insanity having Shields, it was also good for damage as well. I've found my health to be in dire straits, but Energy Drain will give me enough shields to survive long enough for the health regeneration to kick in.
I've used Tactical Cloak in much the same way as you, particularly in regards to quick ammo grabs since I'm an addicted Widow Sniper Rifle user. Sometimes I will go with CQC, cloaking so I can sneak up behind an enemy and then unloading an entire thermal clip of my Tempest SMG onto their back.
When I started playing Insanity difficulty, I picked my squadmates according to the situation. Kasumi has always been a good choice for me -- her Flashbang Grenade is up there with Reave in pure power and versatility. Her Shadow Strike is even better than a Tactical Cloak, because she
will regenerate health while cloaked. Why can't my Infiltrator get a hold of whatever Kasumi is using?

Anyway, as an Infiltrator, I take my biotics in pairs because I'm aiming for Warp Explosions. Samara, Jack, or Jacob with Pull next to Miranda or Thane with Warp. Beyond Warp Explosions, I make sure to pair a biotic with another squadmate (or myself) who can strip defenses fast so it can be followed with a Shockwave or Throw. But on Insanity, the key with biotics has always been getting the defenses down. Warp and Reave are good because they'll damage no matter the defense.
Hmm. If there are collectors and husks involved, odds are I've got a squad consisting of biotics and/or Grunt. Grunt's health is already obscenely high next to everyone else and his health regeneration is quick -- he doesn't die easy on me.
Actually, which squadmates die on you seem to depend on the player. For instance, Garrus is a doormat. (Not in every situation, but often enough.) Some people have no idea what I'm on about when I say that, but others will nod knowingly. Also, Grunt doesn't die easily on me, but some people also have no idea what I'm on about because he's suicidal for them with his shotgun. Other players say Kasumi will likely die after using Shadow Strike as she fails to get back behind cover after the strike, but this is something I never experience.
Legion and Tali. They're a favorite combination of mine because I like to send out their drones in sequence. By the time one drone dies, the other's cooldown has ensured I can get another drone back up again. Harbinger hates combat drones. Geth Primes hate combat drones.
Oh right, my Infiltrator Build. I take squad cryo ammo. Why? 'Cause it's fun. It's nice to have my squadmates freeze the battlefield around me. It's nice to see enemies shatter. Probably not the most optimum use of my skill points, but I don't care.
Grunt, Kasumi, Mordin are my squadmates of choice unless I'm doing the Legion/Tali duo. I'll use the others, but those have always been my top three. Tank, Rogue, Caster.