Depends what you mean heavier monsters, if you're talking about like the Pavise Guards usually you're gonna want to get in closer and meatshot them with the thunderbuss. Barring that, use the rocket launcher
Pavise Guards (if those are the bosses based on cyberdemons) I'm finding take a really long time, yeah. Mainly, it's the enemies that shoot cannonballs since the scythe maps are absolutely filled to the brim with them, they're often at a distance, and in the best case scenario, it takes 5 point-blank shots with the thunderbuss.
As Blaz you could press the zoom button to supercharge your gauntlet and chew through them (though sometimes the flying reaper enemies wouldn't die. I'm not sure if they have some invincibility mechanic.)
Pavise guards are the big fellas with shields who shoot cannonballs. I'll take a look at the damage numbers for them when I get back to updating GMOTA, the Cybermancers should be tough so that's fine. I'll need to nerf Blaz's Hyper mode a little more as it's currently too strong. The reaper looking enemies, the edgelords, they don't have an invincibility mechanic so I'll need to look into that too.
Scythe 2 had some impossible parts in the last episode (Scythe 1 also had these) but that's to be expected since it wasn't designed for GMOTA.
The fire elementals with 100% tracking shots seemed a bit much. If the map spawns one close to you, you're guaranteed to die since they do over 100 damage in a volley.
The cybermancers are generally great enemies, but I do think it's a bit frustrating that their 2 deadliest attacks are the ones that don't have windups (the solid beam, and the projectiles+beam.)
The weapon set is good. Rockets felt kinda weak. I couldn't tell if the alt fire increased or decreased the DPS.