[berettafan]

Also, for a production person i wonder if it makes sense to tie their % w/ some factor that measures lead/production time.

Here's a set of parameters as an example:

Let's say you want 20 days average time from final design to boxes in the warehouse.

Katie (just because it's a hot name) manages a weighted (by cost) average of 18 days.

Katie's % of gross is 0.5.

20/18 gives a multiple factor of 1.1111.

Katie's adjusted % is now 0.5555% of gross.

Conversely if Katie manages a weighted average of 25 days she gets (20/25 x 0.5%) 0.4% of gross.

I'd probably consider a cap in such an deal.