MaximaSEAE01

Hi folks I am not sure if this means anything, but I ran a power balance test on each cylinder and found this:

Cyl1: 90 RPM
Cyl2: 78 RPM
Cyl3: 73 RPM
Cyl4: 75 RPM
Cyl5: 88 RPM
Cyl6: 72 RPM
Eng Speed: 1188rpm
Coolant temp: 192 deg F

Are cylinders 1 and 5 and maybe 2 something I should worry about? What do they mean if one of the RPM is higher and what are the normal specs?

I also notice a soft pre-ignition sound somewhere between banks 2 and 4 if that's anything. Thanks

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MISC INFO:
IACV-AAC/V SYSTEM:
0 Step STALL
25 Step 700 rpm
45 Step 1193 rpm
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Engine @ idle:
651 rpm
vacuum @ 24.4 Step