I just happened to have a bunch of these 4µf caps and we gave that a go and things improved. Onward and upward we went in values to see if there was a limit we could exceed.
10µ was better than 4µ and I think it may have had something to do with the Italian made capacitors which are obviously audiophile approved which can be seen by a closer inspection of the brand.
25µ was next and again for some reason things got better so next up are these banks of 50µ @ 900V caps.
Stay Tuned (or come listen to them in early November at the Capital Audiofest.)