Yep. You'll want to go to SD for sure during those dates. I had my best day last year on April 1st in Central SD and last years migration was 1-2 weeks ahead of this years. If you want to get into a good field with the best chance of shooting birds that week I would hunt Wednesday Thursday Friday if you can or Tuesday-Thursday. It's much easier as one guy to jump in a spread, especially during the week, and with the later migration this year the later dates of your break should be better. Also, don't be worried about the mass of birds being north of you. The best day I've ever had I only saw 2,000-3,000 birds (MAYBE). I've sent you a pm.