Do you have a CRT and Digicam? If so, test it. Perhaps you have a defective monitor.
You certainly shouldn't be getting over 40ms. More like 30-40ms from my testing. If you test, and get that, then I guess you're just particularly sensitive to input lag.
I have a digicam, just not a good one. Probably wouldn't work out to well.
It's not HUGE input lag, probably around 30ms. I'm just extremely extremely sensitive to any sort of input lag. My 22" TN only has an average lag of ~3ms according to what I've read and I notice that something is up compared to a CRT.