Naim 555ps dr

I have just got the 555ps which I use with 252 300 supercap CDx2 and Rega's Rp5 turntable the question is has anyone upgraded the connection from the Supercap to the 300 if so that difference did you find I will change to chord company Sarum as I have it already via speakers and interconnects? I need to make the 300 a dr to bring it into line with everything else... I Currently use Rega's r5 speaker but that will changed very soon for Bowers and Wilkins 804 d3... I must say I am on my 2nd week of the 555ps burn in it the usual character it goes up and down..