Yes the thread is about pressed discs, but you are copying('ripping') them using your burning program(DVD Decrypter). It is nice to know that your drives reads/plays burnt discs fine...can they play a pressed DVD...can they rip a burnt disc at regular speed?
I am suggesting there is a conflict between programs that keeps the transfer rate('read rate') very low on BOTH drives in DVD Decrypter...."asusE616=185kb/s(0.1x)" and "832S=34kb/s(0.0x)". So it is not one drive that is the problem. Since you are also getting many errors during the read, it could be that the discs are very poor quality, but I guessed that this is not the case with ALL discs or you would have seen that. It could be many different things, from bad or loose cables to bad HDD to dirty lenses to ??? So I am guessing first, that it could be a configuration error and maybe a driver conflict or software conflict. The drivers involved would most likely(but not positively) be connected with one of the many burning programs you have, so IMHO I would start (as a first step in the troubleshooting process)by removing all burning programs and install them one at a time with testing in between. It is merely a suggestion of what I would do, you don't have to take it...
It is possible that I am misunderstanding you, and if I am, please forgive me.