Raid Block Building Health

I'm not sure how to make it work,

but when i'm configuring it to what the building health should be, i'm having issues getting it to be consistent,

{
  "Health on spawn in percents (0-100)": 0,
  "Health on spawn in amount (0 to disable)": 100,
  "Structure should be not attacked for X seconds to start healing": 60.0,
  "Interrupt healing at all after getting any damage": false,
  "Heal rate (seconds)": 1.0,
  "Heal in amount (0 to disable)": 2.0,
  "Heal in percents (0-100)": 0.0,
  "Work for Building Blocks": true,
  "Work for Doors": true

Basically with this, if you are in raidblocked, and you dont use /bgrade to place a wall, your twig wall will be placed at 2 health and if you upgrade it to stone, it will still be 10 health and healing, it doesnt change the health to match, like if I have it set to be 20% health on spawn, you will place down TWIG and upgrade to STONE, but the health will still be starting at 2 rather than being 20% of a stone walls health. 

I need a little assistance here.