 you might need to probe the soil and adjust from that to get it right for your situation. When you say probe, stick it in there and pull it out and there should be nothing on the driver? If it's too dry, if the soil is getting dry, it's hard to get the probe in the ground. If it's moist enough, you can get the soil, you can get the probe into the ground, and when you pull it out, they'll be nice.