You need to get the load straight it is one of the largest things with timing
You are correct -2 means it is taking 2 deg from the timing , 2 means it is adding 2 deg to the timing
I like to set the timing tables where it is adding about .5 to 1 deg by it self and you will see this change a lot with enging temp , intake air temp , load etc
NA you shouldnt be seeing more then 1.2ish load
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