My experience with the Mundorf Silver in Oil and V-Caps leads me to believe you would like the V-Cap over the Mundorf. I find the Mundorfs to have a rising response (brightness) in upper mids and highs, others report the same. This will only make for a more anaylytical sound. I would use the V-caps in your amp, adjust with Duelunds in speaker.
I agree with Atmasphere, there is such thing as 'too much detail'. Proper tonality and maximum resolution should sound more natural, more lifelike. Sounds like you have tonality issues, V-Caps and Duelunds will only help overall tonality, both are really 'natural', there is really no downside to either one of these caps. Something else is wrong if your system doesn't improve with these caps. Now, if you're system was somewhat dark, I would expect the Mundorfs could be the best choice.
I agree with Atmasphere, there is such thing as 'too much detail'. Proper tonality and maximum resolution should sound more natural, more lifelike. Sounds like you have tonality issues, V-Caps and Duelunds will only help overall tonality, both are really 'natural', there is really no downside to either one of these caps. Something else is wrong if your system doesn't improve with these caps. Now, if you're system was somewhat dark, I would expect the Mundorfs could be the best choice.