(assuming you're based out of ATL)
Honestly, if I were you, I'd book the cheaper conneting flight via NW through MSP or DTW solely for the MQM's per dollar ratio as it will help you get a little closer to Gold for less.
My first flight after being status matched to GM was DAY-JFK-LAS-CVG-DAY. The morning flights via JFK I did not upgrade on as a gold, but I was #1 on the board when I boarded (didn't know about the "don't-board-yet-just-hang-on" rule with DL). However the late afternoon return to CVG I was upgraded on.
THIS however was the weekend for the final four and every gambler in the universe was off to Vegas that weekend. Traveling during the world series shouldn't be that big an issue for you considering the two teams local cities don't connect too heavily though ATL to LAS.
SO, on the otherhand, yea, you could get your upgrade during those days, but what the hell, why not spend less and get more MQM's?