Im confused by the ordonite processors

I was on UVH1 (just got the game last week) and it just. wrecked. me.

cut to 3 hours later, I'm on easy mode at this point and holy hell these enemies just decimate me, i can't get those canisters in at ALL.

I get to the round where you gotta put in 7 and I just... CANT. 20 enemies who are so stacked with HP it feels like they are on UVH6 or something. and I turned it down to EASY!

How are yall doing this?