Lastly, given the footprint of your front rack, maybe a rack-top bag that's mounted on the front instead? something like this allow you to strap it directly on the rack with no interference with the handlebar, brakes, and most especially the shifter.
Lastly, given the footprint of your front rack, maybe a rack-top bag that's mounted on the front instead? something like this allow you to strap it directly on the rack with no interference with the handlebar, brakes, and most especially the shifter.