Hey, you're 2k to 2.1k? Haven't seen you ranking before. (Or maybe once but I don't remember)
So, basically in OvC you either do miner/sword/sword, or miner/archer. I can't talk about miner/archer as I personally think its harder to pull off but basically you have to keep attacking crawlers and kiting back consistently - or the archer will get sniped. Swords, send them to centre and get control of the tower. Target one crawler and garrison swords that have lost half their health or so, to keep them alive. Early game is all about targetting crawlers, and very importantly, splitting against bombers. If you mess up a split vs 3 bombs, and poof, goes 7 swords...GG right there. Eventually go for an archer so you have enough when their eclipsors come out.
Basically, if you go miner sword sword you try to take tower control, if you go miner archer you want to deal damage, and he can't chase if you keep a far enough distance to prevent a snipe (#DAZSNIPE Rain :P)
GL mate with your OvC - it's really hard because you play more OvO than OvC in rank so you have less experience, my suggestion is to find a Chaos player to play with you.
Oh, and hit me up on enjin or SE (DragonArcherZ 350) if you want cause I want to play you xP.