No offense Atreus but it sounds like you're getting screwed over...unless you've just made a couple of terminology mistakes in your post.
1) Your attorney should not be collecting 5% plus his regular fee. That's highway robbery. The industry norm is 5%, but an attorney getting 5% is getting it IN LIEU of his regular fee, not IN ADDITION to it. If you're paying is regular rate...why does he get a cut?
That information was more for anyone who may have read your post and thought that was the case. I'm assuming your relationship is more normal, and your attorney is collecting 5% + his costs. i.e. for postage, correspondance, etc. That I could understand.
2) Managers are an unregulated business, so I suppose it's okay for your manager to collect 25%, especially if you don't have an agent, but it is a helluva lot, most managers don't take a quarter of your cut. Be forewarned that if you do get an agent, your manager should reduce his take down to 15% on the high end, 10% at the least....
BUT that leads me to my last point.
If you have a manager and attorney AND are getting paid assignment work, and barring the fact that you are a miserable writer, you SHOULD be able to at the least get READ by an agent.
You shouldn't be doing the work of trying to get read by an agent. Most don't want to hear from writers directly. But you have a manager and an attorney, and a stable of directors and producers who should be able to refer you to agents. If they're reputable, they should have relationships with agents that should get you read.
AND if you're good enough to get paid, an agent will be good enough to sign you. If only for the commission.
For instance, this last director who wants you to work on an idea with him. If he's a decent director he should have representation. Ask him for a referral to a few agents.
The business is built upon relationships, and the best way to get your work infront of an agent is to use your relationships with people who know agents.
Good luck.