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There is no balance. The diamondback is literally worse at exploration than a 40k credit ship, how on earth is that balanced?
Maybe because it's balanced for combat and not exploration? The Diamondback looks like a nice little ship for combat and a bit exploration close to the bubble. If you buy it just for exploration, then its not the best choice in that price range. If you buy it for combat and exploration without having to change ships, then it might be the right ship for the job.
And btw: I'm just flying to a 560,000 ls star for a detail scan. I really don't care if fuel scooping is 20s faster or slower while exploring. I always fuel scoop at every star (that allows it) and I usually plot the rout with very short jumps.