Someone mentioned in another thread that ships have always had a hard boost speed cap that can never be surpassed. It's just that we very rarely stumble across it or, when we do, we rarely pay much attention. The Anaconda was provided as an example of another ship where you can see this maximum cap in action. (I have not corroborated for myself that this is indeed the case.)
That's become apparent while comparing my attempts at a Corsair build with my Clipper.
Basically, my Clipper (919t/6A DD5s) can do 481/609m/sec while my Corsair (901t/7A DD5s) can only do 473/600m/sec
It's a strange paradox.
The Corsair needs the 7As because it loses speed quickly (when fitted with 6As)when it's mass is greater than 630t but it never really makes use of the 7As well.
Basically, until you hit a mass of 930t a Clipper with 6As is going to be faster than a Corsair.
Period.
To me, it seems like it'd be reasonable for FDev to adjust whatever fiddle-factor controls speed so that the Corsair at least matches the way speed reduces relative to mass in the Clipper when fitted with 6A thrusters and then give it a slightly higher top-end when fitted with 7As.
Basically, I'd want to see a Clipper and Corsair manage the same speed (with the same mass) when fitted with 6As and the Corsair should be a bit faster than the Clipper (again, with the same mass) and have a higher top-speed when fitted with 7As.
Somewhat unintuitively, the Corsair is actually a slow ship compared to it's predesessor.