Both me and my father are Diamonds and there seems to be a bit more wiggle room with suite upgrades at that level. I originally booked 5 nights in a regular King (1 paid, 4 on points) for my parents and emailed the GM to see if she would be able to apply the diamond upgrade for all nights of the trip instead of just the one night that they paid for. She graciously allowed it and my parents were delighted by their accommodations.

Might be a good time to apply for a Diamond Status and see if you can finagle something like this up.