Final Boss Recommended Level?

Hello, I am Level 30 and I am going to max my pins, I picked three that do at least 50 damage because the ones I was using were a lot less than that, and I had a lot of trouble on the berserked couple you fight at the end of Beat, Day 5. I beat them, but since I had so much trouble I am worried about the final regular game boss. I am not doing post game. I am playing on Easy with the maximum amount of HP allowed. What level do you recommend? Did you also have trouble on the berserked couple, and is the final boss really hard? Thank you.