Agree with Philjolet.
ARC is more transparent, so you probably can tune the sound by changing your interconnects and cables. Nordost is on the opposite side of what you are moving to based on your description. Use a warmer IC and cables first, see if you like it or not, cheaper test. Merlin is transparent also, so you need warmer ICs. Try some cables first, if not work, then pre/power amp's.
ARC is more transparent, so you probably can tune the sound by changing your interconnects and cables. Nordost is on the opposite side of what you are moving to based on your description. Use a warmer IC and cables first, see if you like it or not, cheaper test. Merlin is transparent also, so you need warmer ICs. Try some cables first, if not work, then pre/power amp's.