Nice audio system, fado!
I'm pretty sure I haven't heard Grant Fidelity globes, so I cannot offer an opinion there. I own the following brands of 6SN7 tubes: Shuguang (plain old ordinary, nothing special, but are long lived); Shuguang WE6SN7 (gold base); Linlai 6SN7, Linlai globes (blue), and a set of WE6SN7-plus red base tubes. I kinda think I have one other brand, but I haven't catalogued them all, and they're probably hidden in storage anyway.
I really like the Linlai tubes and the WE6SN7-plus in my amp and preamp. I haven't tried Ray tubes yet, but eventually will buy a quad (not in a hurry as I already have so many 6SN7 tubes).
The Modwright KWA 150 SE is a great amp! If I knew I would/could leave it in place without having to move it a couple times a year, I would have bought one a couple years ago. That sucker is heavy, and my back complained when I lifted it.

Ditto on your Apollo II speakers. I own their little brothers 'Apollos', and I still have to pinch myself to make sure I'm not dreaming. I'll wager you get really good music from your system.

Michael