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Hey Captains,
This is always a great topic to bring up in regards to captain's skills. I almost always recommend CE as your first tier 4 captain skill because you want to be able to have the opportunity to break contact and this helps. The Soviet BBs are a little different in that they do have the limited DCP uses, so I would tend to agree and take FP first as you grind up. I think this also depends on how far along with the captain you are, if it is your first tier 4 captain skill you honestly can't go wrong either way, but FP might be the better choice based on the Soviet BB playstyle.
Feel free to check out this guide I wrote up and see if it has some information that can help you =). Good luck with the Sinop, the ship is a blast to play!