Throwing hat into the proverbial ring! 
Check us out at Fusion Fighters as it sounds we match what you’re looking for.
- Family friendly: we have one couple on board.
- Clean(ish) chat: can’t remember much swearing in chat.
- Casual yet active: we consider ourselves ‘casually competitive’. Active on titans, all flags in (optional) war. Of course, life circumstances could affect activity levels.
- 9-11* titans: Currently hitting 10*.
- War strategy used: Coordinated tanks (currently green), with farming strategy.
- Alliance growth: Currently 27-strong.
- External chat app: Line, though very optional.
One of you could always pop over first to see if it’s the right fit. 
In any case, good luck with your search.