Varying cruise speeds

[Corsair]

Light fighter. One-seat. Not too heavy, I'd say a couple tons.
Heavy fighter. A maybe half a ton more.
Very heavy fighter. Maybe a ton or more added to the HF. All cruise at the same speed.
Bomber: With a full torpedo bay, likely approaching a dozen tons.

Cargo ship. The skeleton isn't too heavy, but you're hauling thousands of tons of stuff.
Gunboat: At the lightest, maybe a few dozen tons.
Cruiser: Getting into the hundreds of tons.
Battleship: This thing is effing massive. I'd say in the kiloton range.


And yet, they all cruise at the same speed, sure, bigger engines produce more thrust, but the ratio of mass is just mind-bogglingly stacked. I know it can be done, to make fighters cruise faster, or bigger ships cruise slower. It would make LFs 'Interceptors' in the true sense.

Off the top of my head, this is what I think cruise speeds should look like:

LF- 375
HF- 350
VHF- 325
Bomber- 315
Freighter- 300
Transport- 280
Gunboat- 275
Cruiser- 250
Battleship- 200 - No thruster, so this is a huge increase in speed, proportional to impulse.

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