Venture needs Salvage Gantry and proper fighter slots, not limited to mining drones.
I think the salvage gantry might be a bridge too far considering this is the 'base' level cruiser in the game. It can already reduce survey costs.
But I very much agree that an unlocked fighter bay like versions past, would make the ship somewhat more attractive for general use.
One of the reasons the Venture exists in the fashion it does and is assigned to the default base_bp, is to give in-game factions without access to a heavy industry the ability to field at least
something that does a passable job of being a fleet anchor.
With the limited ability act as a carrier, the Venture would be a little more effective in this role for the tradeoff that the OP cost of the fighters still has to come out of the ship's loadout thus reducing it's already limited combat potential. This incentivises the use of 'cheap' fighters, but still leaves the option to specialise in that direction if desired.
If this is still too unbalanced for your taste, you could also consider removing the fighter bay and giving the Venture a built-in converted hangar. This would effectively restrict it's use of bombers, and even further incentivise the use of the cheaper fighters.