Don't get me wrong, i'm all up for an agility buff, as that baby really packs a punch, yet:
Dropship, hullmass 580 tons, cargo max 156 tons
Gunship, hullmass 580 tons, max cargo 168 tons
While the gunship has a larger internal space volume wise, the higher rated internal slots are a drawback.
The FDS has 7 internals, the gunship has 5 internals, this limits the versatility a lot.
The lacking agility would be o.k. if the internals were improved, like being split up to cater for even more internals,
actually allowing the FGS to do combat without being a paperplane.
Since shields are weak on the dropship series it would be substantial to have the possibility of being strong on the hull-defense (HRP) but the ship simply cannot cater to this,
due to limited internals:
Dropship maximum defense hull 3260 (military with HRP)
Gunship maximum defense 2775 hull (military + HRP)
Do you see the problem?
The combat ship with weak shields, that has to go for hull defense cannot do so, compared to the Dropship.
Basically the Dropship is faster, more agile and has better defense, all at the measley cost of 2 small Hardpoints and even requiring less rank and being cheaper to afford!
Not even better than it's predecessor now that is sad. That's like the Imperial clipper being worse than the Imperial Eagle if we're going by you know the fact that in this situation it's the equivalent to what the empire has.