my version of a brace....two middle holes are stock with a slightly longer screw, the two outer where just made with a body reamer, and a "flat" washer was put on the inside of the tunnel to hold the screw tight. eliminates alot of the flex, but still leaves alittle due to the carbon strip not being as wide and is only 1.5mm thick.

nice thing is with 8 screws the whole battery side tunnel comes off in one piece

i think if associated made the tunnel on battery side one piece it would fix alot of these "issues"