I have the same engine and jakes. And mine are plenty strong, though I have no idea how strong the mbn motor jakes are.
But knowing how they work, I can't imagine there would be any kind of possible changes to make them different.
Even though they are electrically turned on and off, they actually are hydraulic off the injector rockers.
You might have only partial engagement. They engage in 2, 4, then all six cylinders depending on your switches.