This from hdtvtest.co.uk who reviewed the British version of your panel (in a smaller size):
"The TXL42E5B is sadly not [a] gamer’s panel. The input lag is simply too high for fast-paced games requiring spilt-second inputs, and the motion blur was highly distracting when playing 60p games. It would be better to opt for plasma TVs, since they offer quick response and clean motion in one package."
They claim 42 ms of lag on this set in game mode. By contrast my panasonic s30 tests out at 16ms and my vt60 tests out at 23ms. For reference the new sony w800/900 series test at a remarkable 8ms.
Solution: buy a new tv.