I think that the TIE/CT-thingy is just a horrbile inheritance from Hattrick. From a coaching perspective it is a very clumsy tactical tool. I would either throw it away completely or add some more complexity to it as you suggest with the "tennis table".
In fact I would even want to make it a little more complicated. For instance, imagine that you have played a TIE and lost with just a couple of points, in this case I do not think it is reasonable to have enthusiasm going up. If you loose a game because you do not put enough effort into it you should not gain enthusiasm. That's just ridiculous.
On the other hand I think the more intelligent game shape and training of BuzzerBeater can be developed further and we can then get rid of the quite stupid and unrealistic enthusiasm system.