I don’t know if people know this but,
If you back out of your map as far as it will go, there is a challenge tab. You press right on the control pad on Xbox. It shows your progress for achievements that give you eridium when you complete. Yes I know it’s the, " %100 perfection thing", but this actually shows your habits for playing.
All your rank 5 completed stuff is obviously what you’ve been using. So, to the point, I go through and pick the rank 1 or 2 challenges to see what I can do to pool completing them as fast as possible. Right now I’m running a semi auto DaHL smg build with artillery/singularity grenade mod. And a DaHL assault rifle I have have to use crouching. Apparently I don’t use sniper rifles either lol. You might run across something OP