You're talking about two different things.
The 190-155-110 tiers are the one-time payments from the $2.4 billion dollar equity infusion.
The 5.5%, 5%, 4.9% are for all future payments from league revenues (ie TV contract).
So not only does this deal give more money to the top 3-5 teams in this one-time equity payment, it enshrines that they will continue to get bigger payments for the next 20 years. NU will get screwed now and later! The Big Ten has always divided up league revenues equally. This deal seeks to change that and give a permanent advantage to certain schools, with Nebraska among the schools on the very bottom rung.
The more I learn about this deal, the more I wonder why anyone outside of the top teir would agree to it.