I have tried to issue commands using the FMS software (there seems to be three versions on their website, none of which worked for me). I enter the following "[{"command":"ascset","parameter":"0,fan-spd,75"}] " (without the brackets) in the text box, I click Run and then it seems to get stuck saying "Running commands ..." I wish I knew what I am doing wrong.
Actually, it will not work if you remove the brackets it should be the whole command including the brackets below
[{"command":"ascset","parameter":"0,fan-spd,90"}]
About the aging never heard any issue with using it constantly and actually, your miner is running at performance mode which is higher than the expected hash rate.
Why not try to adjust the power a bit down to avoid the strange behavior of your miner. Use this command below
[{"command":"ascset", "parameter":"0,hashpower,1260"}]
That is a power limit you can adjust it to lower and the hash rate will drop a bit but I'm sure the temp will also drop a bit.