That's great that you finally found the problem. One friend of mine told a few days after the release of the new engine, that BBs have probably forgotten to remove the ratings boost due to the old CT/TIE system... finally he was true from the very first moment!
About playing consecutive CTs: Maybe I did not explain it properly. I´ll try once more: Playing CT reduces the enthusiasm and thus the ratings related to enthusiasm: OK.
a) Playing CT with E=10 will reduce it to aprox. E=5, that's a very clear change in ratings.
b) Playing CT a second time with E=5 will reduce it to aprox. E=2.5, but ratings don´t follow the same decrease as in case a). They are lower but no so much.
c) Now you can play indefinitely CT without lowering the ratings.
This is probably a side-effect of the problem you have just found now. Because this rating boost of CT, somehow, is compensating the enthusiasm effect. Once your enthusiasm reach 2-3, even playing CT again, it will go back to 2-3 before your next match. But the ratings you get are not those corresponding to E=2-3, but those plus the "extra" CT boost, which are more or less similar to play with E=5 ratings. Of course, it depends on each particular team what this minimal ratings are.
I hope this time I has been precise enough.
Anyway, I think that after you solved the first problem, the second one will go away automatically... perhaps too late because now some teams have promoted by playing four consecutive CTs, and this extra CT effect does not affect all teams in the same way.
¡Me aburro! (Homer Simpson)