Not sure what the OP is trying to gain here.

Have the 10" brakes been overheating in heavy use?
Are we trying to add more rear weight?
Are you lacking rotational inertia?
Have the fronts, that do 70% of the braking, already been significantly upgraded?
Is there something amiss with current rear brakes that prevent rear wheel lockup? ( implying any brake capacity after lockup is useless)
Does your car have a Class 3 trailer hitch?

Seems like a low pay off "upgrade".

Others will chime in, "if its your car, do want you want", absolutely.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.