38. Don't update to an "A" rating component, but a smaller class. Keep the same size class and save up.
Guess how I know. Saw an "A" rating FSD, fitted it to my Cobra. Only size class 2, so I could not even leave the galaxy (<4ly jump)
My old class 4 FSD was no where to be found when I wanted to buy it back! Solution, sell the Cobra, get a sidey, and find another Cobra to buy,
38a. This rule doesn't always apply. As a trader you want range over power and can forgo power hungry weapons. This mean that for your "power generator" at least you could drop to a lower class if available and get slightly more power but because it lighter your FSD jump range will increase.