As an active investor in Miami, this is my biggest hurdle when looking for prospects. It is so difficult to get in touch with LAs. In Miami, everybody and their mother has a real estate license, so it is common to bump into agents that do one deal a year and really know close to nothing about the real estate business. People in bad financial/career situations see real estate as a light at the end of the tunnel and then when they realize the amount of work required, they stop pursuing it. I convinced the guy that sold me my shirts at Macy's that he'd make a great real estate agent. He later texted me that he was "for sure getting his license" and he'd call me when he had it. This was one year ago and I haven't heard from him since. This is the type of person that represents the masses in the real estate field in our area.
Of course, there are very professional agents in Miami. I'm not saying that all of them are like this. I personally work with 4 or 5 amazing real estate agents who follow up, answer their phones, speak English, and know how to draft contracts, but chances are 9 times out of 10 you will run into these "wannabe agents" when trying to purchase good deals on lower end homes in this market.
Offering to give them the full 6% commission is a good way to motivate them, provided you are able to get in touch with them in the first place. There is also a survey that goes out in the "showing assist" after you request a showing on the MLS. I find that when I give bad feedback on those surveys, the agents suddenly appear and want to help you. I think it is because these surveys get sent to the Broker after they are filled out. But in this situation you've already started off the relationship on a negative note.