I have both FSR and DLSS off, but Vulkan still seems a little blury, gets even more blurry when TAA is highter than Medium.
DLSS should replace the standard TAA when it's enabled. You can also replace the default DLSS binaries with a newer version and use something like nvidiaprofileinspector to force a higher internal render resolution (to turn DLSS into DLAA) plus a different DLSS preset (E usually does pretty well).