Throw 2 separate Remix motivator boosts on both these guys.
Example: using Denard at QB, so Denard and Jackson LTDs set for Jaguars run motivator boost. Achieved tier 3 by adding 92 Robertson-Harris at RE. Powered him up to 99 with points and set the same boost for tier 3.
Then, picked up 92 Kelvin Beachum at RT and powered him up with points. (He gets 0ap SP btw) Added Cardinals run motivator boost. Allows me to boost the crap out of Larry Fitz not that he needed it.
Best part is I put Jaguar/Cardinals chem on both Gronk and Calvin Johnson. They get the motivator boost from both!!! I just got rid of Tony G because Gronk is now 99 everything including all blocking stats. Calvin is CRAAAZY now. Same with Fitz.
This all really shows up with the RUN motivator boost on plays after the catch. My WRs just truck right over any safety at all. Their blocking is stupid good now too. Highly recommend doing something similar with the double boosts if you can