I would definitely say make jurors go through training and pay them more; a lot more. The more expensive for the state to prosecute someone, the better.
Why would it be better for it to be more expensive to prosecute someone? The point of laws is that we'd like to see them enforced. If the people don't like the laws they should change them not try to cripple their government's ability to do its job.
"That it is better 100 guilty Persons should escape than that one innocent Person should suffer, is a Maxim that has been long and generally approved."