Damn, that's a lot of words. Too bad I'm not reading them B-)
Nah, just kidding, I read it all and I see your concerns.
My main idea for that fight was for you to see how you can both vore and fight at the same time and how they could coexist.
Enemies do actually damage you from inside after being nommed and can escape if too much damage is dealt to the player. So if the damage debuff and the defence debuff works well both for taking less damage whie they're inside and to deal extra damage if they so escape.
Either way, I see your point and I can also fix it with one simple tweak:
Lowering the Slime Queens stats :)
I honestly don't like what I did with the potions as they're supposed to be last minute items you need to reserve for special situations, but I had to put them almost everywhere just to make the players survive.
So, I see your point of view but to not make the player frustrated and think it is too hard since they *had* to use a potion, I'll simply lower the slime's stats instead. That should hopefully even out the slap-match you had been going through lol
But that will be after i return home, as I am currently talking through my 6 year old laptop XD