I earlier commented that reverse from engines under the wing would produce a nose-down pitching moment.
On further reflection, I realise that reverse can produce a nose-up moment about the maingear, even when the engines are mounted below the wing.
Because the distance is short, it won't be nearly as much as from fuselage mounted engines; also thrust angle from the pavement comes into play.
So with spoilers and reverse contributing nose-up moment about the maingear, you do need that much more nose-down moment from the braking -- but with poor braking action taking away from that nose-down moment, is there a safe cushion that can be counted upon before the nose begins coming back up
As the consultants love to conclude their reports, further study is required.