You out-rebounded him while playing 1-3-1. When that happens you aren't going to lose many games.
1-3-1 is risky, but it worked. Normally in this defense you are going to get out-rebounded but he couldn't play inside. Now the question is whether or not you should stick with 1-3-1 or if you should go to 3-2. I know you won with 1-3-1 but you could fall for a LI trap with a team that couldn't execute it before. Here is an example that my team had.
(32963602). Later in the year I bought 2 15K big men but at the time I was starting big men that I had on my original team. Also note the rebound difference. +19. Also you are at home so if it stays the same with the points you will lose by running 2-3 you will make up with homecourt advantage.