Hi Ramy,
Sorry to hear of your challenges. I am no expert, but i have had my share of "challenges" over the years with integrating a new component/cable into the system. There are (at least) two possibilities here:
1. the VDR is balanced to have more bass, or is not a good match with the Nemo...and you need to find a better match to demonstrate the Nemo's evident capabilities.
You may find old reviews about Nemo (i literally have read every single article on every single component i own or have seriously auditioned...just to pick up any experiences from reviewers about speaker placement, odd mis-matches with cables, etc).
2. On the other hand, it might be that the cable is allowing more power thru the Nemo...and the Nemo is responding with far great weight/impact...and your speakers perhaps need to be repositioned for this. i do not know your speakers...but your post makes me wonder. If you are hearing "too much bass" (and if you think the VDR is suppposed to be a reasonably balanced cable)...perhaps you need to reposition your speakers (ie, further from wall, further apart, watch side walls...all the things that can make a speaker "boomy or muddy" in the bass).
The reason i suspect either option is because you say the stock cable is better than VDR. Some stock cables are truly excellent, and some manufacturers select their stock cables very carefully...but generally i have found if you get a high quality cable, you will hear certain improvements...not necessarily worth the money, not even necessarily all good (ie, mis-matches in cable/equipment) but given your lack of success in finding any cable to improve the stock cable, i do wonder about that.
my 2 cents. pls post back and let us know how the PS cable works out. good luck.