as TV without PVR is all in-sync not sure what I could adjust.
The TV might well have per-input settings. You need to check the TV's settings for lip-sync while you are using the PVR as input.
as I can't go lower than 0 (be good if there was that option)
How? Crystal ball?
taking it up in 20mS increments its definitely gets worse , I have on a few occasions seen it better at 0
You're confusing me. Let's suppose there is no error in the source material (which, as noted above, there sometimes is and you just have to ignore it). Let's suppose there is a 10ms delay in the vision pathway so that the sound is emitted 10ms ahead of the vision. If you're sitting less than 3.4m from the TV, you will receive sound ahead of vision and that will seem odd (because it never happens in nature). Greater than 3.4m and the speed of sound in air has caused a delay which eliminates the problem, but it will still seem odd because normally sound arrives slightly delayed from vision.
Adding 20ms delay to the sound pathway (which is what the lip-sync setting does) means the sound will then launch 20ms minus 10ms, = 10ms after the vision (given the conditions stated above). That will sound fine, and a 10ms delay between (say) seeing a snooker ball hit another ball and hearing the click will not be noticeable. 10ms is well within the real-life experience, and represents being only 3.4m (11 feet) away from the action. Do people complain about the sound delay when sitting in the terraces at a football ground? No.
If the lip-sync setting (everywhere!) is zero but there is still a disturbing delay between vision and sound (which will be of the order 50ms, not 10ms), there is nothing more you can do. If, with lip-sync = 0ms, sound is arriving ahead of vision, it will sound unnatural and the setting needs to be increased to the first "notch" where the sound is natural. At that point any delay will be unnoticeable.
What you might be having trouble with is identifying that the sound is ahead of vision. The brain isn't used to that, and I find it is hard to figure out what the problem is, just that there is a problem (until I realised what that means). If in doubt, set the lip-sync to maximum and then there should be an obvious delay between vision and sound (use material where there are sharp events - that's why film-makers use clapper boards). Then reduce the lip-sync setting notch by notch until the delay is unnoticeable, but don't go beyond that point (which will then confuse matters because of the unnatural effect). If you've reached zero there's nothing more you can do.
If you are (somehow) hyper-sensitive, just moving away from a real-life source of sound will introduce delays of this order of magnitude and you should also be sensitive to that (you have my sympathy). Otherwise, trying to tune this to the point where the sound reaches your ears at exactly the same time as the vision is not representative of real life, and is a fools errand because the broadcast system is not (and does not need to be) engineered to have that kind of precision (and will not be equal at all places in the room).
Nonetheless, as noted in post 8, the CF has the ability to tune the lip-sync setting in 1ms increments – but whether those increments are actually acted on is a moot point (it would require a sophisticated set-up and careful measurement to find out).
