I had this problem, Lellow helped me out, so I will pass along what he told me. You only have so much money and if you spend your cash flow, you don't get more money. What you have to do is NOT give your position coaches the money they are asking for.
You can sign a new position coach to a 200,000 contract. Don't get attached to your position coaches. As long as no one else bids on the coach, they'll sign with you. Just get a young guy and sign him to a 6 year deal. The money you save will go directly in your cash flow.
I went insane until someone told me this...