[Foglifter]

Did you know there was a Stormtrooper hitching a ride on your seatpost??
Anyway, I would think you've added just enough to the rear to unweight the frontend on even the smallest of bumps. Could try overloading a tankbag to put your CG back towards the front. Could also lighten up the Scott with carbon rims and some lighter pedals... saddle... etc.

 

[Foglifter]

I've seen someone else with this setup but had it further fwd over the passenger area. I don't recall where exactly, but it was on this forum.