A medic will reduce the experts / rookies death rate when your planes are killed, and vets / experts / rookies death rate when you are hit by shells. no vet death when planes are killed. You wont see any improvement before your medic is high enough, lets say 70+...
same thing for seaman, it doesn't adds a lot, so you won't notice it before very high level. Seamen do stack, but with diminishing return like engis, with a worse ratio than engis, sth like 100% 33% 12% for 3 similar seamen.
To answer your questions, I'd say you should get a seaman because it will improve your fighters and add SD, but more than 1 is not necessary, get engys instead to escape from subs. A medic is a good idea if you plan to have more than 100 vets on your pilots.
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