You forget that humans can match namek LP.
In POB most of fighters used 20 con/50 resistance x2 rings and full con armor and props earrings and CON Dogi, matching base SK HP, since SK use %LP,%lp,con armors and mostly everything else props.
Like I said, it not only it would help chef, it would help its party and I am sad to see that you are still stuck in "Korin Platform" set of mind, where people do not even give af about it. It is there to have fun when you are bored, nothing more.
I think the grand chef needs more ways to improve his PVP, and no more ways to keep his friends immortal, that ideai from 23% to 40% would only be fair if it were applied to yourself only.
And yes, I'm thinking about the arena because that's what gives us reason to grow in the game, or do you grow up and stay talking in kokkara?
Let's get into the reality:
SK LV70 with 1 piece 27 cons = 25k LP
(Sk gain 80LP per con)
Miraculous Cheering + Defense breath = 61con
61x80 = 6180 + 25,000 ~ = 31080
31k + 40% = 43k LP
That I did not put the dragon buff.
Now add ridiculous damage of human + set +12 on SK ~
In short = Imbalance, I can not even believe I wasted my time trying to show the obvious.
You know that this is how it works, no human full buff manages half the life of a sk full buff currently, even with items +14 (my case).
Grand chef needs a rework on some useless buffs, not the increase in support.