Martin Logan ReQuests and Mesa Baron

Are there any ML ReQuest owners out there that are using tube gear. I have a BAT VK5i/Bryston 4BST combo. Want to try the Mesa Baron (Tubes). Cables are Nordost SPM. Looking at trying to smooth out the slightly Edgy top end. I think my problem is the Bryston although it gives damm good bottom end. Appreciate some good advice on this and balance.