Yeah, in your way of playing you need to give up some Galleons to get cargo which usually brings you profits but also makes you wait for new Galleons to be built before you go on a next hunt and makes you lose all the crew experience you might have.
I hunt with fleets of 3 ships (3x Cutters very early, then 3x Xebecs, then 1x Brig + 2x Xebecs (my fav. early tbh, Brig has a huge crew and good speed so is very good for boarding, it also has more ammo than Xebec) or later a pair of Frigates (they both are experienced and supported by a back-up war fleet close by which takes out any bigger war fleets of my enemy). I usually sink the flagship of my opponent right away and then just pound at other ships with "Rout" skill and cannons until they give up. I have marines only on one of my ship which is designated to conclude boarding operations, other ships fly empty cargo bays.
This way I can steal 2-3 ships from my opponents after beating them and usually most of the cargo.
And by the way, I think I asked for a "Create New Fleet" button on the after-battle screen long ago in the suggestions thread. Since it wasn't picked, I guess it's intentional that devs make us abandon lots of ships and cargo. A way to nerf human player from conquering too many ships at too short time.
Still, even the way it's now, most of my pre-East-Indiamen fleets are composed of stolen ships. I especially like grabbing Flutes and Galleons and forming huge convoys of them to trade with India (like 1x Galleon + 4x Flutes or 2x Galleons + 3x Flutes). Even most of my Frigates and SOLs I steal from Pirates (my most glorious victory was boarding SOL46 from a Brig, imagine how hard it was even with him having his masts down). The only thing I really build in mass are East Indiamen.
In my last 1.06 Hard game I only unlocked Xebec, East Indiamen and Frigates. Other ships I never built on my own as a house rule. And I think thanks to clumsy pirates I actually assembled a fleet of 5x Galleons faster than I would via saving cash and buying them in a shipyard and waiting months for them to be built. That's something worth trying when you are bored of playing the normal way.
