Coaching rating is extremely high when you choose Let Coach Decide and have defence and offence tactics that are effective against your opponent. If they have LCD set with Base Offense and Man to Man then they will get a high coaching rating.
The way you beat this is to look how the team scores, using the box score or the match viewer.
If they are scoring inside then put 2-3 Zone as your defense and put strong inside defenders playing as your center and power forward.
The ratings at the moment don't accurately reflect team performance. From what I have heard there is a new ratings page being worked on.