First of all, don't stress about the blood. From our over 1 year experience with the two laying ducks, the blood tapered off very quickly...matter of a couple months. We attributed it to their young age and their bodies normalizing to laying eggs. We have had an occasional egg that had a little spot but nothing to hardly notice.
As far as stress and acclimating to new environment and integrating with another duck goes, I would say keeping them in a confined area with plenty of room to move around is a good idea...as long as no mean pecking is going on. They should learn to not think you are the momma! They should be able to cope without you around...very important, just like a puppy or any other domesticated animal. Give it time.
Finally, the on again off again laying has occurred for us several times in the 15 months of laying. The two Cambells layed 250 or more eggs, each, that first 12 months, but the the last couple has had them alternating laying and we only average 6 or 7 eggs a week instead of a dozen. I am pretty certain that since the weather in Indianapolis has finally given us a spring instead of continuing the 5 month winter, that they will soon get back on schedule. If not, I joke with my son that we will at least have Easter duck for dinner...he does not laugh at that.
Anyway, time will tell and good observation/notes will help you determine if there is any issues. For now, just make as many non-stressful changes but get them acclimated to the new environment.
That's my relatively limited experience advice...good luck