Those grounding clips are going to be harsh on the bikes frame, probably causing damage which will weaken it and become a dangerous stress raiser that will eventual cause a catastrophic failure.

Neoprene lined stainless steel "P" clips are more than adequate for a bicycle rack, I supply 4 off them with each front & rear porteur rack I make: One for each side of the forks and two and for either the handle bars or seat stay tops.

Replace the supplied as stanard A2 stainless set screws with BZP high tensile set screws and nylock nuts, which when correctly tightened the "P" clips will easily support 40lbs each and will not damage or seriously mark the frame.... the neoprene will slightly mark the paint work which can simply wiped away with WD40 or 3-in-1 bike maintenance spray.