Questions re those annyoing transport stream transfers

So, now that Comcast has switched my beloved Turner Classic Movies to Mpeg4/H264, I am forced to archive movies using transport stream rather than program stream. My goal is to transfer the movies with as little alteration as possible, so that I can later transfer them back or stream them with no loss in quality. However, it seems that transferring the movie in transfer stream, in and of itself, introduces artifacts in the movie. Here are my questions:

1. Is there a program that does a better/the best job of transferring transfer stream files from Tivo to computer? Kmttg? Tivo Desktop? Archivo? something else? I would really like to duplicate my experience with program stream transfers, which was flawless with Tivo Desktop and Kmttg

2. Is it true that undecrypted transport stream files can't be transferred back to a Tivo? That has been my anecdotal experience with Tivo Desktop and pyTivo

3. What is the best program to decrypt transport files? Handbrake seemed to make the file unwatchable. I'm currently using VideoRedo

4. What is the best program to transfer decrypted transport stream files back to the Tivo? I can get pyTivo to do it, but it takes a 3G file and turns it into a 20G file on the Tivo, which I would prefer to avoid.

Thanks very much for any help!