D as in dates... ahhh, those grow on palms, not just coconuts...
@Veggie Dave, have somebody look over the entire regulation.
My guess is that your palm keys are way too open, so those notes are sharp and then the C# will be flat - relatively speaking. If you lower the palm keys to bring them in tune with the C#, then you have a good starting point for the rest of the regulation, my guess again is that all your keys are way too high. A good tech can probably fix this in an afternoon's time but it is a tedious labor of love procedure. And it is like a piano, you can only tune it when it is in tune, so it is a rinse and repeat procedure where you gradually sand off tiny amounts of the regulation/bar corks until you have the horn play in tune.