Hate to be so blunt here, but it's pretty clear why you're struggling. Do you ever read the pbp? If so, how could you miss how EXTREMELY fatigued your kids are. You're R/S 1 kid, and another is a walkon getting little minutes. So, you're playing FCP, uptempo with 10 players, 7 of which are freshmen or sophomores, who have relatively poor stamina (esp. for the fcp), and whose IQ's and DEF ratings aren't to the level needed for the FCP in the new engine. Further, you're not playing pushovers and are getting outrebounded on both ends of the court, leading to more "touches" for the other team and more chances for you to hack away, esp. when your guys are gassed. Add it all up, and it's a recipe for losing some games you think you should win. The FCP can still be effective, but you definitely have to have the right horses to do it with now, and I think you fall short in those categories I mentioned above.
Edit: Ha, guess mmt beat me to it, but the same elements clearly stuck out to both of us.