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[konrado5]

I thought that turn off trellis slightly raise my synchronization rate because I didn't know about coding gains. I known only about overheads. Doesn't trellis carries any overhead?

[kitz]

So you found out weve always said dont turn off TCM.. and youve actually proved turning it off is a bad idea.
Does it matter now that you know the theory is correct?

>>>   Doesn't trellis carries any overhead?

Yes it does.

But the answer isnt that simple...   it uses parity bits. 
Cue a long answer which I do actually know the answer to...  but Konrado you exhaust me..  and I dont have the will power to type out an hour long post.

Clue research data transmission and you will find that all types of modulation or protocols or even data storage contains at least some form of parity or redundancy.    There are different methods and protocols for data transmission, some are more efficient than others, but may carry a price in other areas.   ie speed v reliability.

Every single data transmission carries some sort of redundancy or parity.    The internet wouldnt work without it.   Try also researching modulation.

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As kitz has said, if it works better leave it on, if nit turn it off, bitswapping makes my connection drop within minutes on a 9db noise margin, and seconds on a 6db noise margin, my connection works when bitswapping is off, therefore I leave it off. I questioned this on the forum, and it just seems to be one of those things. So leave trellis well alone as it improves your connection!