I'm having trouble getting lending institutions to help me find ways to fund a business with less than 20% cash injection. They don't say that the business doesn't seem viable or that EBITDA isn't high enough.

This would be my first business purchase, and my third attempt at getting funding for a business. I hear a lot about LBO's but can't quite get the numbers right to secure that kind of financing. My credit score is 10 to 20 points below 800, depending on the agency.

Any advice or tools that I could use to maybe help me value a business in a way that would help with securing funds?