I play diplos,dm in bigger teams or ffa, also 1v1/2v2 tournaments. I would try other options aswell. Just what im into at the moment. So the clan should be more open to everything. I dont like clans which are too big tho. But i dont want to get into something, whats dead after a month.
If you're looking for a good mix of Roleplay and Strategy (more roleplay than strategy, at that) -> CORP does it pretty damn well. On the roleplay side, their templates are the best out there if you ask me. On the strategic side, they are pretty inclusive.
If you're looking for lots of activity and usage of clan forums with focus on RP -> Wolves, though you'd basically be expecting mostly diplomacy-only and several tournaments at our current state. FFAs are a bit rare. Still, games pop up quite often and our forums are more active than some of the public ones.
If you're looking for frequent 1v1 and 2v2 tournaments -> AOE has a lot of tournament invites, but not many FFAs and borderline OK activity for diplos.
If you're looking solely for Roleplay -> Then you'd have to have a nice chat with some leaders out there to see which fits you best + accepts the stats. To name a few, Vitrix, USSr, {rp}, W.U., and such.
If you're looking solely for Strategic -> You'll have a lot of problem with these crummy stats there since strategy clans are mostly rather exclusive. Judging by the description and your stats, though, this likely isn't your goal.
If you're into stretching your name as big as possible -> The Juggernauts are 10/10 at that. They are rather sandbox-ish - good on both strat and RP and tends to have several innovative games too.
If you want to see a clan that is pretty much just starting out and watch it grow -> The Falcons are changing quickly with SirSalty now, and there are several new clans out there - the frenchy napoleonic thingy I never remember the name, Grande Armee I think, and the islamic-themed one that some quite well-known Real-Time diplomacy players started, Bakkah-Mecca.