Meathook - SSG - Blood Punch
Puts Cybermancubi and Arachnotrons in glory kill state if caught at point blank, great damage, staggers for follow up.

Meathook -SSG-Heat Blast
Takes out weak points, good damage, staggers enemies.

Grenade - SSG - Ballista
Great for locking down the Knights and other fast heavy demons, great damage, easy to follow up on.

Precision Bolt - Rocket Launcher Loops
Insanely high damage if mastered, great for slow demons and the Icon of Sin.

Chaingun - Grenades
Easily takes out the Knights and Barons, great damage, also works on tankier demons.

Lock on Rockets - Meathook-SSG
Great for taking out Pain Elementals and does great damage to other heavy demons.

Rocket Launcher - Ballista
Very easy to pull off, great for the Icon of Sin and Tyrants, adding normal and freeze grenades can also lock down other super-heavy demons. Also good for the Icon of Sin

Precision Bolt - Ballista
Huge damage if done effectively, can take out demons from a distance, as well as being useful for the Icon of Sin.

SSG - Ballista
High damage, great for Mancubi and other slow Demons.

SSG - Precision Bolt
Use this if low on Ballista ammo, it does almost the same damage.

That's it for now, I'll be adding more once I invent more combos. Cya later!