Here is how I have moved my fans, their are strapped with zip lock to the PCIe cables, temperature dropped with almost 20 degrees, now running under 40 degrees overclocked to 211, getting 485 GH/s. 231 and 251 are not working very good for my miner
not sure on those temp readings.. I saw without the shroud you get less drop and tilting down kept more heat on the boards
are you 20 degrees less than stock config?
you might also be pointing directly onto the temp sensor. I forget where that is but if it is working for you don't move it !