Bid specific pairings in your first 2/3 layers make it the dream bid, then back yourself down to what you can hold. I'll bid pairings in my first couple of layers and then go down to pairing properties and line properties. Your graph should start out small and open up each layer until you're at 7. I take my % in base and bid down until I have a layer that's greater than that... I know I'll be able to get pairings from those layers easily.