Pool,
besides of the joke I made in the previous post, I honestly believe that you are not getting the things right. The final reserve is the 30 minutes that the GCAA talk about. This 30 minutes appears in the circular after your divertion, not before, as it does in the FOM. "Delay" is simply because one would land as soon as he could after the divertion; so if he doesn't (another ACFT in Emergency, time required to remove workers from longest RWY if desired...), he still have the 30 minutes to play with.
Don't take me bad, but if you leave cargo behind just to put 3 ton of EXTRA FUEL in order to comply with what your are calling as "30 minutes mandatory contingency fuel +Final Reserve"; you will be called to the office.
If you have a good reason (WX, route, alternate,...) by all means take the fuel and leave the cargo, but your interpretation is not correct and may put you in trouble.
I won't make any further comment. This one was just to be sure to myself that I tried to help you.
Pitoss