I have found that the McLaren front axle rests on chassis posts under the axle where the grub screws would come up to adjust the axle. My low profile Zero Grip tires do not come close to the track because of the posts. I believe we need to amend the rules regarding chassis modification to allow removal of some axle post material to facilitate use of the grub screws to lower the axle.
The alternative is probably to run the taller profile ZeroGrip tire like a gt car would have. I would prefer to prepare the M8D like our Group C cars with low profile tires in front