Rabbit
3 golden carrots
3 jump boost II potions
I would much rather get a food kit with baked potatoes, over giving this kit some insanely OP food. Golden carrots are maybe even better than golden apples.
Debuffer
1 weakness
1 slowness
1 blindness (10 seconds)
And cause friendly fire on it to be even more of a pain? Debuffer is pretty powerful as it is, so I don't think it needs a change.
Buffer
Regen 1 for 3
Seconds
1potion of healing (splash)
I don't think it needs a change, as little to nobody's going to use the kit anyways. This probably isn't a valid reason, so:
A single potion of healing is worthless compared to a gold apple, and regen from the potion can easily be reproduced by eating steak/gapples. Heck, you can even chug a few apples to get full saturation.
Eggshell
20 diorite because i never have enough for my egg.
Not 20, but maybe 10 or 12. That was it's enough to cover the egg with a single layer. (10 is minimum on most maps)
As Kronos said, this would outclass the use of money bags for blocks, which lots of people do already. (In order to start a bridge to an island while the others get basic rushing gear)
Eggarmor sorry for the yellow
Protection 4 on OP mode
If one kit gets changed depending on the mode, all kits get changed depending on the mode. I don't like this, as I think that you need to be careful with what you pick in order to be prepared for a certain mode. inb4: "but what if I won't know what the outcome is?", In this case, you select the kit which would benefit you in both modes. For instance: If the game were to become hardcore, does that mean Healer and Egg armor need a nerf? Not at all.
Let's not forget the respawning problem where players constantly come again and again, throwing away their endless lives. This would make it THAT much harder to kill them, as they take dozens of hits to kill AFTER they already hit you a plethora of times with their spawn protection.
Feather falling
Extends to all armour obviously boots that you buy
I guess this could be changed, but it doesn't have to be. In a game, if you have full iron, you can just switch to these boots for a second so you can drop down a big distance to take minimal falldamage. After that you can just put your other boots on.
Also: Leather boots give you an equal value of protection as the chain boots, so it doesn't become useless that quickly.
Also also: Why does this item not get prot 4 in OP, while Egg armor
does get it? Questions questions questions....
Overall, I don't think the kits need changes to be honest.