I’m thinking what you’re saying is that the game’s Scaling is Stupid for that boss fight?
One of the things you learn on your first playthrough (if this is indeed your first) is just how many of the side quests you need to complete to stay on level or over level yourself.
On thing I am going to recommend to anyone playing TPS, especially if they are not on PC and not playing with the patch:
If you want to get to max level (70) I suggest completing every mission as you go along so you get maximum XP for those missions, inclusive of the Claptastic Voyage DLC. Do this for Normal & True Vault Hunter mode. Yes, you will be over-leveled for some parts of that game, but does that even matter since the goal is to get to Ultimate Vault Hunter Mode where everything scales to your level?
If you don’t approach it this way you will have a very very frustrating time grinding XP to get to level 70. The scaling seems balanced such that you have to complete everything along they way to get the maximum XP and even so, it might require some farming after you finish it all. At that point resetting your play through to get all your weapons near level 70 would put you in a position to hit 70 if you hadn’t yet.