@Derelict
As this example already used 241out of 256 of that /52 for PD why would you want use the lacking 15 for something else?
I know this suggestion might seem a bit too pettifogging but I'm just trying to make sane suggestions.
I've been trying to exploit IPv6 since 2012. I might have had my issues with how to slice bigger prefixes like /48 or /32 into several chunks 
. I work at a provider where I replaced my boss's ridiculous chunks with sane ones 
.