Piperboy,
I suppose your 4banger is carburetted? If so the fuel/air distribution between cylinders will not be perfect, each cylinder will not have the same power output.
Being on the rich side of peak EGT this will be less noticeable since the power curve is fairly flat there. At 75% power or higher, you want to be at least 100°F ROP on the first cylinder to peak on the EDM. If you are at 65% or lower, you can't hurt the engine with the mixture knob and I would lean to the onset of roughness. The EDM will tell you if the CHTs remain safe. The EGTs are for 'navigation' on the power curve only, the CHTs tell you how the engine is feeling. EGTs are nearly instantaneous, CHTs take more time to change.
With a carburetor, you may get slightly smoother LOP operation with a little bit of carbheat, or with the throttle just a tad closed from full open (more air turbulence in the intake channel).
As noted before, the John Deakin articles about engine management are the best you can find.