In your current set up, unless your interconnects are above 2m length or more, XLR will absolutely do nothing good to your system. In fact, RCA should be a good choice.
However if your system is fully balanced i.e your preamp, cd player, amp are truly balanced design then XLR would be the only choice. The bryston combo you have does provide balance output but they are not fully balanced design nor your Arcam player.
However if your system is fully balanced i.e your preamp, cd player, amp are truly balanced design then XLR would be the only choice. The bryston combo you have does provide balance output but they are not fully balanced design nor your Arcam player.