BAT VK-51SE in the rig!

I was hunting for a balanced Tubed pre to replace my Levinson 380s. I had a short list of contenders, ARC Ref1 / Ref3, Aesthetix Calypso, Allnic L-1500 and the BAT VK51SE. The more I kept reading about the BAT the more I favored it. Long story short, I found one in absolutely pristine condition, locally no less!

I’m sitting here listening after about an hours warm up and ouffa! What a completely different animal compared to the 380s. The BAT crushes everything that impressed me about the 380s. I’d appreciate any advice on this unit or BAT gear in general. Quick question for anyone in the know; does this unit benefit from tube rolling? Think I read somewhere NOT to mess with the OEM’s.