lazs,
What are you on?
Perk planes, other than the F4U-1C, are all nicely identified as such and are easy to avoid. Due to the icons they carry perk planes are a disadvantage to the pilot in them, not an advantage. If everybody flew Spitfire Mk IXs the way Spitfire Mk XIVs are flown the K/D ratio of the Spitfire Mk IX would be higher than the K/D ratio of the Spitfire Mk XIV. The only reason that perk planes, even the Tempest and Me262, have a positive K/D ratio is because people fly them in a fashion that is dictated by the knowledge that they are being singled out for destruction by the majority of the enemy players in icon range. That is something that your FM2 or F4U-1 never has to deal with.