I am not an expert. But setup and testing methodology is everything. Looking at your image, I have no idea what you measured. So much in testing is important, I don't know much about it unfortunately. But I do know that to even trust someones RMAA results I would have to know the absolute levels used, load applied, PC sound hardware used, and settings of the PC and device being tested.
I didn't have to be an expert to listen to my headphones(K7XX) to determine that my E5 was making crap, and that was the only reason i actually measured it @50% vol low gain also tested line out, and then retested it all to be sure. Must say i was shocked as the E5 actually comes with very high recommendations from sources like headfi and i bought it based on that information. Also tried uninstalling reinstalling drivers, made sure firmware was updated and tried it on a win10 (laptop) and a win7 machine (desktop).
Could be that my unit was defective, but i doubt it.. later found one single youtube review that mentions that it is v shaped output even when you disable everything. but yes basically all other reviews of this unit, are positive.
maybe it could be fixed with some hacked drivers or some other magic, but it should work as advertised out of the box. My onboard and my new Micro IDSD have no problems generating a satisfying result in the same test with both measurement and listening.
Also tried the E5 with Rainbow 6 Siege, and had a harder time hearing other players position.. it was all very strange, so i returned it.