Beautiful picture! I only play clean, so that's probably the main reason why I don't notice much difference between the two.
I guess you don't move around your rack yourself? The weight must be pretty insane. BTW, your SVT2 looks like new!
What do you use your SVT7 for? As backup?
Could you tell us more about this particular point? How is it sweeter?
I've only had the 2-pro for a short time and found it at a great price. I was very surprised at it's condition, as it looked like it was never taken out of the box!
Our rider specifies moving crew to be supplied by the venue, but there are times I have to move it. Fortunately I always have help either way as that rack is definitely a beast to move! The 7-pro I've had for much longer and use just as you thought - as backup. There are few times when I don't use a cab, so I'll run direct out of the 7-pro if that's the case.
I don't run the 2-pro very dirty, but do dial in a bit of grit to the tone, so it has just a bit of hair on it. It's just past what the 7-pro is capable of doing, but I'm very happy with the tones from either amp. I do notice with my settings on the 2-pro, that it will do just what you'd expect a tube amp to do, and responds with grittier tones the more I dig in on the bass; the 7-pro does not provide this type of response and seems to stay pretty even tone-wise no matter how hard I'm digging in on the bass.
As for the "sweeter" comment, I just think the 2-pro has a rounder sound to it, with a different heft to the notes than the 7-pro. To me there's this characteristic bloom to notes from an Ampeg tube amp and I hear that in the 2-pro, but not the 7-pro.