Never tried a vintage Dovo, but I had 2 Best Quality, one was a 5/8 and the 2nd was a 6/8Which Dovo models so you have experience with? i only have 2, an old "new" B-L and a vintage "1",neither are exactly new models.
I did not own both at the same time, the first one was warped, the second I don't remember the issue with, but I sent the 2nd one out to Rasurpur when he was still in business, (I believe he retired) and he told me about a few issues the blade had, I was still pretty new then, and I traded that Dovo in for another razor I from him.
That was NOT a Dovo, it was however a modern solingen, and it was just as bad as the Dovos.
Correct me if I am wrong, but I heard that all modern Solingen brands get their blanks from the same supplier, so I suspect that the blanks used are not that great or the QC is lacking.
Either way, this has turned me off from all modern Solingen razors.