Hi Lon, without letting the cat out of the bag I know the situation very well. Relax though, this is good news, you don't have a problem there, you have a blessing. These doubles are made to extremely close tolerances. I am a metallurgical engineer as you know and i took a magnifying glass to these surfaces. Yes the action is stiff, but you will notice that it is uniformly so as it opens and closes. There are no high spots I could discern, just perfect still marry up all over.
It simply has to wear in a very little bit. My advice is:
1. Wipe off as much of the grease you put on the surfaces as possible.
2. Put on a very light coating of very light oil onto the mating surfaces.
3. Work the action until your arms ache, maybe three hundred times.
4. The action will have eased up, not from wear, but from pressure smoothening.
5. DO NOT use any abrasive creams or any type of abrasive, you are not needing to remove metal, just pressure smooth the mating surfaces.
6. When the action is as easy as you like it (it will always be a little stiff, it is the nature of the modern close tolerance), then clean off all the surfaces and rub on a minute amount of moly di-sulphide paste, very little and rub it in well. those surfaces will now probably not wear at ell for a very very long time.
7. Now just oil very lightly and you are good.
My double is now much easier to cock and on top of the above action working I have put about 100 rounds through it. Yours will loosen up, it takes a bit of time.