Yeah I like my oil weights to be fairly close all round but so much depends on the pistons as well and the track conditions and temperatures.
But as a rule of thumb, I'd begin with trying to get something that is within 5wt front/rear of each other and a little heavier in the front. So i tend to start with 30wt front and 25 or 27.5wt rear.
But the trick is as jcb commented - it's all about balance. Achieving the right balance will make the car behave itself in the variety of conditions and situations that are encountered in an average lap and race.
HTH.
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