Iowa; Doesn't need Engines. Reduce the fuel to about 5 days for your shields. Have the % shields about 10-15% (your current is 6.4%). Try to fit more weapons on it. Needs a missile sensor (resolution 1). Bring up the size, its a station, have fun (I usually have weapons platforms around 40k tons).
Forrestral; Good job on the design.
Shipyards; Build more. Build them bigger. About 1 naval per major class size wold be a good start (4; Capital, Cruiser, Destroyer, Frigate) but more is better (Battlecruiser, gunship, extra, ect). Just up the size and slipways for the commercials (3-5 is plenty your whole game).
Research; Don't worry about the cloaking at the moment, try to take care of research that would immediately help you (weapons, engines, firecontrol, sensors). Btw, you have some nice researchers for early game.
Note; Just so you know, mesons don't do any physical damage, they only mess up electricals (sensors, fire control, engines).
Sorry, I was thinking of HPMs (I don't usually use any of the weapons other than kinetic/missile and lasers). Mesons do inflict physical damage as well ignore armor and shields, but only 1 point of damage.