Hey man! Welcome
What civ bonuses are worth it to use depends a lot on what kind of game you're playing. You say you play P2N, but that you don't usually fight until Renaissance. Does this mean you and your buddies have set rules in your games that you're not allowed to attack early?
Also since you're using battleship attack in your civ it looks like you're playing on a map with water. Is it islands by any chance?
One setting that we play a lot online is P2N Large Islands F11 60. F11 is hotkey to see the in game time, and F11 60 is a rule that you're not allowed to attack or land on enemy islands before game time is 60 minutes.
Civilizations used in P2N F11 60 basically always have Citizen Cost Reduction, gold and iron mining in them. Because these bonuses are really helpful.
If you're playing a game similar to this then if you're gonna take something out of your civilization I'd take out Farming bonus before Citizen Cost Reduction. In Prehistoric age you only have forage and animals as a food source, because of this being able to produce more citizens from this very limited source of food will greatly boost your economy for the long hall. In Stone you also have fish as an available food source, and the Cost reduction on Citizen also count for fishing boats. This means you'll be able to afford more fishing boats as well. Farming bonus kicks in quite late, and unless you're playing on very small islands where space is a big issue, you can always add more farms when needed.
What I would add if you take out the farming bonus are military bonuses. Siege Range, Bomber Speed, Fighter Speed, Frigates Range, Galleys, Transport & Subs Range.
Anyway, hope this helps and please don't hesitate to ask if you got more questions.