I have only been playing on normal, but my best run with the Kestral Type-A was me getting all the way to the boss ship and dying rather quickly to it. It was a good run though, because I managed to get all 6 alien races as crew mates, which caused me to unlock Type-B of the ship. The problem was that I had the same weapons I started with, and I ran out of missles. I was unable to beat anything with 3+ shields, so I had to keep jumping away from battles in sectors 6-8. Somehow, in sector 8, I managed to secure 6 missles and defeat one rebel ship, but then I had no missles for the boss.
Things I learned after playing the game many times... Missles are life. Conserve them, hoard them, and buy them whenever possible. Drones are powerful as hell! Having a racially diverse crew can be sweet.
So, has anyone beaten the game with a Kestrel Type-A on normal difficulty? I wish the game offered more weapons to deal with those 3 and 4 shielded ships.