and the comp model might actually be the best in sports.

It's the one sport where diminishing returns is almost precisely predictable: Post 32, everyone starts to slide a bit.

I wish NBA contracts that ran past age 31 were front loaded but cap standard.

You extend Dame for ages 32-35 (4yrs) @ $191M supermax, you pay him on the following schedule:

Yr1 = $75 mil ($48 mil counts toward the cap)
Yr2 = $65 mil ($48 mil counts toward the cap)
Yr3 = $30 mil ($30 mil counts toward the cap)
Yr4 = $21 mil ($21 mil counts toward the cap)

The avg salary should count toward the cap for the front loaded yrs (when the players value is closer to the Super/Max payment) and the cap hit lowers as the returns diminish.

This would allow teams to reward and keep their best guys but not hamstring the franchise when they're playing in their twilight.

As the cap stands, Supermaxing Dame's extension is really a bad business move. Dame at 35 won't be anywhere near as good as dame at 29 and at 35 he could be eating up 1/3 or more of your cap space.