CTing makes ENTH higher for that game. So let's say its adds a .5 multiplier. A 5 ENTH would be like having a 7.5 ENTH on NORMAL. But for the advantage you end the game with .5x less ENTH for the future. You leave the stadium with a 2.5 ENTH.
TIE makes ENTH lower for the game. assuming this multiplier is .5 too for simplicity's sake. A 5 ENTH would be like having a 2.5 ENTH on Normal. But for that disadvantage you end the game with .5x more ENTH for the future. You leave the stadium with 7.5 ENTH.
Then ENTH adjusts nightly toward 5 on kind of a parabola it seems but you still will go into your next game with more than 5 or less than 5 ENTH depending on which option you choose.