I have lag with Zen on the TV as well. Havent tried Pinball FX2 tbh, but there is some really ****ty interaction between my TV and the PS3. 360 on my TV plays like a dream luckily and I ahve now purchased TPA on it.
Then I'm guessing in your case, the lag with TPA in your situation could even be worse than what others are running into. If you are seeing it in other ps3 games, then ya, definitely something else is at play other than TPA in your case. Curious that it doesn't affect the xbox. It would be interesting to see another PS3 hooked up to that TV to see if it does the exact same thing.