Honestly, best bet is to just hammer the VPD with complaint emails and phone calls if you have a valid case (ie. vehicle that received a VI but passed without any changes) and bring up the fact that you are concerned that their officers may not be interpreting the MVA correctly (ie. stock vehicle with VI). If an officer is unable to interpret the MVA correctly then that officer should not be enforcing it as they don't have the appropriate training or judgement to do so. When they receive enough complaints they will look into it and review it. Until then nothing will change. 1 complaint every 100 VIs sounds like the officer is doing a pretty great job to me. 20 complaints every 100 VIs and that will raise an eyebrow (just throwing #'s out).
If you have a valid case, you HAVE TO file a complaint. Right now this is OUR problem, but by complaining and taking up the VPD's time/$/resources it becomes THEIR problem as well.