I found Mission Control too conservative with any setting for marathon races. Assistance is too low to keep up with the racing snakes. In a race is all about the pace. I use Eco at 30/50 with Trail at 50/80 for the steeper climbs only. If you have 10kms left use Trail mode if the terrain allows. Warning - do not go below 10%. Limp mode is a beast on a Levo after 60 kms!
You are better off managing your own power.
Smart control imo gives you too much power at the start of the ride and too little when you need it towards the end. But the flatter and smoother the ride the more accurate it is in power delivery. It’s accurate in getting you to the required distance.