I'm glad the braking issue appears to be resolved. It can be truly exasperating.
I'm used to a ton of braking with my Z06 and expect nothing less (within reason) from the Cobra. The 5/8" front gives me what I'm looking for. I was so woefully inadequate when I started (1" fronts and 7/8" rears) that after the M/C shuffle (4 renditions) was the first time I was ever able to drive the Cobra without constantly being on the alert for potential "braking deficient" impacts.
At least mine was one of Lone Star's turn-key cars so I've someone that I can blame..