This is a very common problem for musicians in general. If it's a 70/30 split in favor of the players that's not a bad split. I would suggest you try renting a hall and doing the whole thing yourself...byob, etc. Maybe hiring another band to play with yours or something like that. Or open your own club and be the house band. The main thing to remember is that club owners are only concerned with the bottom line. They, usually have no concept of music beyond it serving the purpose of drawing people in to drink. When you operate from 'that' reality in relationship to them you don't get disappointed or steamed. I've met a few over the years who 'get it', but they are rare. Just keep in mind you can only make demands when you are in a position to take or leave a particular gig. Indifference is power. So is money. Just be diplomatic enough to make the club owner think they are doing you a favor if they co-operate. That it works to their advantage for one reason or another. Truthfully, unless you have the stomach to be a ruthless manipulator I would recommend hiring a manager.