I had some time today to build something to close the case of the S5. I still have the miner standing vertical. Closing the bottom of the miner helped in bringing temps of blade 2 down 3 degrees. But covering the top was not as expected and caused blade 1 to increase temps by 2-3 degrees and blade 2 increased by 1 degree. Fan speed increased two steps too. So now I am using vertical setup with standard fan, closed bottom and run the miner at 393.75 with 1280 GH at 43 degrees max.