I actually have an "ok" guard. My main options from the closed guard for example are kimura-guillotine-hip bump sweep combinations, I fucking love the hip bump sweep. When it comes to open guard, I go for X guard (I get a lot of high level grapplers with it) and sweep. My main focus is almost always to sweep when i'm on bottom, i'm not a good finisher from there. I'm a guard passer. That's where i'm much, much more effective. And you said it, my main weapon is my back taking. Even my nickname comes from that (I compete quite often, and here in spain pretty much everybody that knows me knows me for my back takes and RNC). What I do is, when I pass the guard I inmediately go to north-south and look for the kimura, when he goes to all fours (they always do that since I give them that space, it's actually the right thing to do) I "follow" them to take the back. Even if you see it coming, it's not easy to avoid. Over the time i've developed muscle memory when it comes to back takes, and i've come to take the back from all kinds of scrambles and weird situations, it's become an instinct (but only because i've focused so much of my training on it).
Anyways by explaining this my point is I would recommend people to get the basics completely covered, and THEN you have to start developing a game, it's better to have a special skill in one particular aspect of bjj than to be "ok" at all things (well, at least that's my humble opinion, others may disagree). Now i'm working hard on my wrestling, it's actually gone leaps and bounds (used to suck completely) and I may compete in the spanish wrestling nationals in the future. Though wrestling here in Spain has so little following, its sad really.
Oh and yeah, that was Desafio Azul (the blue challenge), it was a special competition they did where they selected the "8 best blue belts" in the country to do a televised tournament in Galicia. I was lucky to be chosen to represent Andalucia, it was a pretty cool experience, I lost on the first round after having a war with a rival I have (he's beaten me twice now) of 23 minutes, the fight is pretty entertaining though, the rules where no points only submission. Initiatives like those are what Spain needs to get BJJ growing faster.
Anways, thanks for the kind words! It's 9 pm here in Spain, so i'm gonna go ahead and play some pokeman!! (see if I get the hang of it, fuck man this is so addicting) hahaha