Do I have a chance at beating this DWI?

. I was at the lake that day and stopped drinking around 5:30. I had a total of 4 beers that day and was acting very responsible. My boat ingested water in the engine so I spent some time from 6-9:30PM working on my boat and getting the water out. Left my unit and got on the highway . I was sending out an email while driving and did not use blinkers when changing lanes. A cop pulls me over and I drive a few exits and pull in a gas station. Refused to pull over on the side of the highway for my safety. Cop asks me if I had been drinking and told him the truth. He got me out of the car and got me to perform FSTs. He did a total of about 5-6 tests. I felt I did well on the walk and turn one leg stand. He said I passed the one leg stand and failed the HGN & walk and turn. I counted to 10 instead of 9 to prove to him that I was fine. He made me take the walk and turn in sandals too and I felt he never explained the instructions well enough. He arrested me based on the tests and refused the breathalyzer because I don't trust the reader. Brings me to jail and then no testing done in jail even though I requested it. Now I am headed to trial and will have the cop testifying and the video. What are my chances of beating this? They also searched my truck and found nothing. I was only headed home and had stopped drinking like 4 hours before the incident.