I was, too. Warrior was my first favorite wrestler, and I don't know what kind of joyless bastard you would have to be to hate Randy Savage, so I was happy neither of them sold out at the time.
As an adult....Flair and Perfect went a very long way to accomplish something that they could have gotten from jumping Savage in the parking lot before his title defense against Flair. If the in-universe goal was to injure Savage's knee going into that match, this was kind of a needlessly elaborate plan that could've easily backfired on them. If the real life goal was to create added tension for the Savage/Warrior match, it's not like either of those guys need help being paranoid and insane. I was actually watching their tag against the Nasty Boys from the SummerSlam Spectacular just the other day. You totally buy that these guys would have dissension even without an outside heel party getting involved. So the storyline comes across as kinda pointless to me.
I would guess they were hoping to make one of them snap and burn out at the PPV then pick up the scraps. When it became apparent that was not going to happen, they just fucked up Savage's knee. I would assume the main thing was for Warrior not to get the title.
Divide and conquer. Attacking Savage in a parking lot just damages Savage and could mean Warrior gets the title. Using mind games to get them angry at each other means that they have a violent, mutually damaging match instead of a clean-cut, scientific match (I know, I know) between respectful athletes, and thus the match takes its toll on both men, hopefully leaving Savage injured for when Flair gets a shot at him and comprimises Warrior for any future challenges.
Besides, villains love overly elaborate plans, it's one of the great traditions of villainy. Flair was probably operating under the rules of the Guild of Calamitous Intent.