I would suggest that if you play PCT the enthusiasm effect should be the same as a normal CT.
The whole point of the change was precisely to NOT have that happen.
In some leagues, there is a huge difference between both conferences. So, while one team struggles to reach the final and lose all it's enthusiasm crunching all the games, the other one can take it easy and reach the final with a very high enthusiasm.The first team would then have no chance to win, excepted if it is far better than the second one. That's not fair for that team.The change in enthusiasm is to prevent that to happen.