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Hello, I have a 2017 Subaru wrx with a stage 1 tune 93 from MAP, I recently noticed my dam dropped to .812 and then a day later dropped to .625, I have received the fine knock learn of -2.81 and the .35 and .70, and -.35, I recently today noticed I had feedback knock of -4.11 and -8.71, should I be worried? Should I go back to stock or change to Cobb 93? I refilled with a new tank of gas yesterday and no changes have occurred and have still received knock. What is the best way to resolve this?
 

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2019 WRX
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Maybe try the 91 octane tune? I ran their 91 octane tune for a long time with no issues. It could be a fuel quality issue. You could just empty your tank, refill somewhere else and see what happens first.
 
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