Actually the data base that the body fat measurements are entered into does have the capability to set up individual weight loss programs for each wrestler. Also, coaches don't have access to the data base in order to discourage any data manipulation, so that part of the plan isn't feasible.
Furthermore, there is already a ton of paperwork that needs to attended to by the coach through the season and having an additional duty will probably not be very popular.
Finally, officials are just there to skin check, weigh-in, and referree. They want no part of getting involved with coaches' weight loss tracking.