Dodgy Dyno Operators at EasterNats

[geea]

Just got back from EasterNats and i'm a little disappointed. I was hoping to do ok in the dyno comp but the car didn't read very high. The dyno comp is run by Mike's Dyno Tuning in Dandenong and they apparently can measure fwkw's on a chassis dyno. He said it was real acurate on manuals but was sometimes a little out on autos. He gave me a reading of 339.6fwkw's. I believe that i have 328.7rwkw's.
If this is correct then i must be a legend to be able to get 1850kg (car fuel and me) down the 1/4 mile with a 123mph with only 339FWKW's. I tried explaining that the car must have more and that the dyno was reading wrong. He said there is a small margin for error in the auto's. I pointed out what the car had done on the track and said if he still thought what the dyno said was correct. He said if thats what the dyno said thats what the car has. I pointed out that the car also had a 2700stall and he said that would have a little affect but that 339.6fwkw's would still be pretty acurate.
Talk about a complete idiot. He even had a mate there trying to support him and telling me about various other cars that were also running mid 11's with 340fwkw's. When i asked what sort he said VL Commadore's and similar. I pointed out that my car was 400kg heavier and he just said that the dyno is correct.
I'm not happy and would like to be able to do something to rectify this but don't think i have any options. What are peoples thoughts?