Clear, many thanks Cap1! I do not quite understand yet why the jumper leads make a difference over the internal links, but if it works for you, then great. I have the kefs bi-wired.
I have the outer bungs in the rear bottom ports only, so will try placing them in the upper ones too. Will try the granite board as well, as I have the spike shoes directly on the floor (wood).
My amp is a moon 340i and have as well the chord hugo dac (just have digital music). Both are really good, so do not think the problem is there.