The main issue with changing the health is then the other better weapons would make the fight even easier.
You either leave the stronger melee weapons untouched but then the fight would be way easier with them.
You could also nerf the stronger weapons, too, which is honestly fair. 30 damage compared to the crowbar's 10 at the cost of a bit slower swing speed (doesn't even affect it being better) is a bit much, I feel it will make the post-nerf boss(es) kind of a pushover from what I am seeing.