I have a Rega P25 with the provided RB600 arm and an Ortofon 2M Blue cartridge. I'm considering upgrading to the Nagaoka MP200 cartridge. Will I need to add a VTA adjuster to get the most out of the new setup? It seems Rega recommend never doing this so I was interested in what others have done here and results observed and also if it's an easy thing to change.