Level 17 is way over leveled for the heist. This mission is designed for level 8 to 12.
Check you have configured your difficulty scaling mods correctly. I don't know why you are complaining about the difficulty when you are running 2 mods that radically change the difficulty of the base game and can be configured to be as easy or as impossible as you want them to be.
Because I don't want to have to use mods to have decent difficulty scaling in a game? Or maybe because even with mods to try to balance the game better, it's still nowhere close to what it should be.
Probably both.
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Feel free to prove it to me by showing me how you own the scene I gave in the OP.Using any dmg mod seems pretty whack to me since the game is straight easy on very hard without any kind of mods...