1.
I would like to point out that the Hoshiko Cruiser, act much like a mobile repair platform, and has the same short coming as they do. The short coming is that under focus fire, a 300 hitpoint repair(I think that it is bigger then a repair plantform, but still has the same short comings) is gone as fast as the rate of repair. I have noted, that there are times, the when the hoshiko can repair fast enought to same a capital ship, but can't save a lower class ship. I think this is do to the difference in armor between a capital ship, and a lower class of ship.
In order to make the Hoshiko and for that matter, the Cielo usefull, you must use them together. The Hoshiko can repair the hull, while the Cielo help to recahrge the sheilds. One of the changes that people posted about, was that the Hoshiko repair, need to also have a shield restore, as focuse fire, would remove the hitpoint as fast(or faster) then they could be repaired. I still don't under stand why people did not note that the shiled restore that was badly need, was on the Cielo.
Remeber, that even thougth, all sides, have defensive and offensive ships, they still work differently form one the other. While the Advent and Vasari turly have defensive and offensive ship, the defenseive and offensive abilities of the TEC ships, are split between the Hoshiko cruiser and the Cielo cruiser. In other words, the Hoshiko has both a defensive abilitie and an offensive abilitie, just like the Cielo has an offensive and defensive abilitie.
The Percheron in my mind, is about the same, as any other carrier cruiser. Its use is up to you.
2. The problem you ask about for this one, comes down to the old, Battleship vs. colony capital ship debate. There are post on this for battleship, for colony capital ship, and for other ship. I can't really help you there, with out more information.