i would also suggest that shield generator get a softcap. After reaching this cap, they slowly start to become less efficient and maybe the max shield hitpoints can't be higher than the 50 % of the hull-HP.
Trading is much to easy. I need about 20 mins to go from 10.000.000 to 30.000.000 Credits by trading body armor to militarystations. I think items with a low volume shouldnt have a big credits value, because i can store hundreds of them in a small ship and the profit is much to high if you have a good relation to a faction. I bought bodyarmor for 90.000 and sold them for 105.000, after 2 runs i have the best relation to the faction and can buy them for 75.000 and sell for 125.000. To buy and sell from trader to trader is much harder, but the militarystations pay to much.