100% agree on wintertime being perfect for those "indoor sports".....like acoustic measurements
Really that is same for me, kids/life/work/yada-yada during spring/summer/fall, winter seems time to get this stuff done.
Buy yourself one of the newer calibrated USB measurement mics, there is a great thread here to support and guide you
+1 on KERG K4MS system, I've used mine for countless applications once I got it.
Those USB mics look like it would greatly simplify the process. Which one is top choice? The Dayton UMM-6 or the MiniDSP UMIK-1 model?