We just updated to the latest version of XenForo and v2.2 included a lot of updates so a few things might look off at the moment. We're working through them and please let us know if you spot something. Thanks!
Where you actually save your master league game, there is another option in the save menu called save "my team data". then when you load that up in an exibition match, all your players will have their increased/decreased stats.