Here's what I suggest you do:
1. When you run pug HM FPs and get grouped with really good players, add them to your friends list.
2. When they're online, try to pull them together for operations.
EC and TfB can be tricky to master and are heavily execution-based. Most people solve this by getting in a guild of like-minded people. If this is something you're not interested in, try the above. It will at least give you a starting point of people who are likely to do well in the ops.
To add on to this once you have a good friends list of capable players create your own private pugging channel. Have anyone that you invite to the channel invite good capable players to the channel. Pretty soon you will have a solid pugging channel. Capable of building a solid pugged ops group in no time.