I got smacked around by an outlaw destroyer, and when I went back to homebase for my sweet free repair from the perks I got scammed by Dax! Am I understanding incorrectly how the perk works?

From what I understand this perk should make the cost free if the damage is not below 70%, right?

73% hull integrity (current integrity) to 74% cost 15 credits
Full repair cost is 405 credits


Apologies if this in an known issue OR if I am understanding this incorrectly lol
(Tried to post images with links to imgur but forums would not let me post)

I think the idea is that you get 30% discount. So instead of paying, let's say 100 credits, you would pay 70 credits.

The perk reads "Free hull repairs up to 30% of the maximum hull hitpoints when docking."
If it was a 30% discount it would say something similar to the first upgrade perk: "Pay only 70% for hull repairs."

Maybe overthink these system.
I don't think many people will come with below 0.3 back home, special when you are at other systems anyway.
Mosttimes you use a nanobot as reflex when you are below 0.3, or healed up at some other way.

Maybe say Dax got good connections to most repair facility managers, and you get 10-30% discount at this way.
Or remove the homebase restriction at last.