Boss type enemy damage

So for a while now ive been heavily struggling with boss damage like i can do high lvl enemies and all that no sweat but as soon as a boss comes around my damage turns to wet noodles while I see someone slap a boss like it's a lvl 1 enemy.

However the only way ive been nuking bosses and getting by is because of the latrum incarnon which has been carrying me for boss damage.

My main weapon I use across the board is my basmu (absolutely love this gun to bits even b4 the augment), tennet glaxion, latrum incarnon (my current boss and acolyte killer), silva and ages prime, caliban scythe prime (venato I think).

Im not sure if its because im not understanding damage for how bosses work but im just struggling so if anyone could help me out thay would genuinely be great.

This is why i wish the simulation mode had access to some bosses so people can test against bosses and not run a whole mission just to find out something doesnt work then repeat another 20x or so till something works