In x-wing Decimator has higher speed green maneuvers than YT-1300, so maybe it could get speed 3 - it would make it different to YV-666.
Hull - 6 or 7
- I must say that I don't really like high hull values on "big ship" squadrons - I don't know how many ships are represented by one stand, but it is strange that they are so much more robust than snubfighters, especially against capital ship fire, while actually bigger ships should be easier to hit by piont defence than a swarm of smaller and usually faster targets. In fact it is practically impossible for Victory to destroy a single YT-1300 in 6 turns, but no problem to shoot down hundreads of Tie Fighters. And the fact that roughly half of available capital ships can deal up to 6 hits to Firespray (6 turns) and 3 on average, while Firespray can deal up to 12 and 9 on average through 6 turn of fire is quite difficult to explain. But maybe one stand is a lot of Firesprays.
I share the same idea. An ISD would have a hard time roasting a YT or YV over the course of a game has always been a bit hard to swallow since they are "bigger" targets. This is the future after all their targeting computers can't suck that bad.
It was partially also why I wondered if the VT shouldn't be a flotilla instead but then I think you have the interesting problem that in flotillas vs squadrons, flotillas seem outclassed in favor of squadrons. If you discount the scatter, 4 hits from a squadron and a flotilla is doomed. Not far from tie fighter territory. Sorta minimal anti-squadron.... (1 black, 1 blue, 2 blue ... kinda ew) but at least shoot against a wide arc.