Mod number 1
Enemies have more health at Insanity difficulty level:

if you ever thought Insanity is not enough then install this.
There are some versions to choose:

• Insanity2 - enemies have health like another level above Insanity
• Insanity3 - like 2 levels above Insanity
• Insanity4 - like 3 levels above Insanity
  

Compatible with any mods what not modify enemies health at Insanity difficulty level.

Mod number 2
Shield gate mechanics mod:

Do you like Shield Gate mechanic in ME3 for enemies? With this mod you can turn it on for enemies in ME2 to increase difficulty.
You can also enable Barrier Gate and/or Armour Gate for enemies (gates are at default enabled for Shepard and disabled for enemies ).

Shield gate works like that: if last shot dmg is greater than actual shield points then it will not penetrate health (or armor if enemy have armor ). The same goes for barrier gate. Armor gate works similar (if last shot dmg is greater than actual armor points then it will not penetrate health ). 
So for example if enemy have 100 points of health and 10 armor left - and your shot making 70 dmg then with Armor Gate enabled enemy will have 100 health after getting shot (armor when breaking absorb damage ) - and when Armor Gate would be disabled then enemy will remain only 40 health.

Reasons why this is interesting:
-to make game harder 
-If you want be more "fair" to enemies (Shepard have all Gates on at default and it can't be disabled )
-If you want game similar to ME3 (in Mass Effect 3 enemies have at default enabled Shield Gate at Insanity difficulty level and partially in Hardcore and Normal )

INSTALLATION (ME3Tweaks Mod Manager needed )
1. Download mod
2. Open ME3Tweaks Mod Manager
3. Drag downloaded file into Mod Manager 
4. For Gate mods just Apply or import the mod. If you import - click mod name on the list and then click Apply Mod at the bottom right of the window.
In case of Enemies Health Mod: select version what you want and click install or import mods (you can unselect those one you don't intend use ). 
5. Repeat steps 3. and 4. if you installing more than one file.

This mod works only with Mass Effect 2 Original Trilogy (version for Legendary Edition is HERE ).


UNINSTALL:
In ME3Tweaks click Manage Target (first make sure that location for Mass Effect 2 Original Trilogy is selected ) and find this mod (it is in default opened bookmark: "Installed DLC Mods" ) - click delete mod.


ACKNOWLEDGEMENTS / CREDITS
Kudos for all folks who first find and share what commands and values in Coalesced files do specific things.

Big kudos for Mgamerz and ME3Tweaks Group for tools what make making and installing mods convenient:

ME3Tweaks : ME3Tweaks Mod Manager


OTHER MY MODS:
For Mass Effect 2 (Original Trilogy ):
ME2 Tech and Biotic Powers Penetrate Shields
ME2 New Upgrades
ME2 Almost Unlimited Guns (switchable any 5 weapons )
ME2 Infinite Sprint (run without need of rest after few seconds )
ME2 Skipping dialogues without selecting response
ME2 Auto cover off
ME2 Corpses stay
ME2 Changes for Import Credits from ME1 save (many options )
ME2 Changes for Resources import bonus (many options )
ME2 Crouching plus Better Accuracy (toggle or hold. many key options to choose )
ME2 Toggle Walk (no need hold button to walking )
ME2 No auto weapon swap when gun empty
ME2 Decals stay
ME2 10x Time Speed Up Button ( useful for skipping )
ME2 QoL. mouse acceleration off. infinite run. separate use sprint cover. time speed button. toggle walk

All my mods for Legendary Edition are HERE
Mods for Mass Effect Original Trilogy are here: ME1, ME3