I don't think speed 3 matches Wookiepedia, given the ship is explicitly identified as slow...
I think we all agree it is too small to be on a capital ship base.
Honestly, I think the base YT-1300 in wave 2 is very similar to the role the Gonzati. (Shipment escort)
And given the pirate control aspect of the ship, we should likely include escort.
Perhaps a speed two (or even 1), escort, with counter 2, with only two blue Attack dice, one blue battey armament.
This represents the escort / anti-pirate role of the ship in shipping convoys. (Similar to the Flower class corvette / various DEs in WW2.)
The reason for speed 1 is the Imps have a ship that can increase squadron speed. A speed 3 ship with escort and counter 2 is definitely on the OP side.