Since all your segments were C+ (100%), your MQD = MQM/5 as expected. I assume the price you paid to DL Vacations was considerably less than the MQDs earned.
I recollect reading somewhere on FT that you are doing MRs.
I have a JFK-LAS-JFK DL Vacation booked for Memorial Day weekend, NOT a MR, but I'm not using their hotels, hopefully my trip posts correctly.
Yes all posted correctly. I'm sure yours will as well for Memorial Day weekend.
MR through Delta vacations in Comfort Plus or First Class seems like a great way to earn MQDs