UGH! DA's

Why is it when we're negotiating with district attorneys they don't realize how much were giving already. My client is charged with three Robbery with firearm. We only did one... Okay we were there but only actively did one. The rec was 20 on all. I tell them no and they come down to dismiss one and plea to 18. I counter with dismiss two and plea to 10. They said no. I tell them they've only come down two whereas I've come up 10 and they need play ball. yes i'm probably setting this one for trial.