The important part of the result is the full request and full response from UPS.
I can see that it isn't returning any negotiated rates. It doesn't error, but it is returning the base rate charges.
You should be able to copy and paste the code from the private message below and ask UPS why it isn't returning your negotiated rate. Once it returns the negotiated rate we may still need to do a slight update so that it is used, but first thing is first in getting the value returned from UPS so that we can potentially use it.