Like @Big C, I just played my first round of the year on my home course yesterday. It was a little bit of a struggle, but not awful, with one nice birdie putt on the par-5 15th. I gotta start somewhere!
OK, I'm a fool, I see it now.
Using those numbers, I see DDA as a 0 handicap (0.4955 actually, rounding down), and agree with your calculations for Dan and yourself. Having DDA at scratch makes the calculations simpler than having him giving back a stroke. If you're playing any kind of match play, I always play off the low handicap in the competition, so even if he WAS giving back one, I wouldn't be subtracting one from him, I'd be giving you and Dan one more stroke apiece. This is consistent with Appendix C, Handicap Allowances.
For you, getting 7 strokes, I believe you should have 4 on the first 9, and 3 on the second time around. This is consistent with the recommendation in Appendix E to allocate the Odd numbers to the front side unless there's a compelling reason to rate the back 9 as the more difficult side. Obviously, since you're playing the same 9 twice, there's no compelling reason.
My father gets numerous golf balls from my Aunt who lives left of the #7 hole at Tanoan Country Club. Left is better than right, but unless you live behind the tee box you're going to get balls landing in your yard.