No reshoot. To allow a reshoot would open the door to shooters complaining that the RO failed to stop them when they did have a squib and ruined the gun.
I've shot that match. Nice guy, but he's pretty much a loud mouth hillbilly. If it's you're first time up there make sure you speak slowly so he can understand you.
Practice, practice, practice. I see it the same way as any other sport, trying to use your weak hand instead of your strong hand. Look to replicate a mirror image of your strong-hand shooting.