[Jotaku]

I also feel like unless you use weapon that gives you initial incediary, it's not good to combine the concept of heal-fire.

Ok, so I added more health, this will increase the Temp. Attack and Defense range (on HP) a bit. 

Eh I can use 70% HP instead of that?

you can, it only reduce Attack -10
Not sure if this will make a difference in PvP

I guess you are right. There is disadvantages as well.
Personally I think, when it comes to put a slot, 70% is maximum for hp slot and 10% is 1/7 of 70%, while 10% is 1/10 of 100%, which is maximum damage that a weapon can give. So probably I guess, hp 10% is but more valuable than atk 10%  for this strange reason.

Even though it was 14% decrease drop of atk (becuz 14*7 is nearly 100%), yeah I don't think it can make some visible difference.

So you are right. It just depends on each person. I would only put 70% hp if I found there was a blow that killed me by oneshot when my hp was full before die.