Negative, no. These effects are meant to speed up advancement for those who'd like to stay low-tier and take profit - ehm - credits from the benign conditions.
Of course there's no detailled official statement and the rules may be changed sometimes, but two effects are well-known:
- Winning credits in tournaments and RGs forces the average down and may sidestep the saturation number. It hits on payout day.
- winning (challenge?) matches against higher tiers may (or may not) cut off substantial slices from the average. I experienced -0.7 as a TM when winning against a Legend (rated but no challenge).
The latter describes the short route. When becoming TM with 63 average, play and win some matches against Legends and you're at 61 at lightning speed. Saturation? Dunno.
BTW: These rules do not apply to Legends and TLs.