It would be a trivial matter to correct it.

In my former life, it was rather easy: the responsibility for dealing with ALL aircraft performance issues fell upon the captain. That isn't the case here with EWBS, TPS, and VAQ doing that work 99% of the time.

Checkride day always involved the crew doing a load manifest and calculating v-speeds with the QRH: ready to go in the sim briefing room. The new hires got plenty of practice actually planning flights beforehand in training, and for the recurrent crews--it was simply the paperwork that preceded any flight we made.

Of course...we had a FULL DAY of performance in class, complete with a review of Part 25 performance guarantees/constraints and the full catalogue of aircraft spaghetti charts.

Here, they could simply make every other IPT/CPT/sim flight a charter flight and add a FULL DAY for performance in class; that would SOLIDLY enforce an understanding.