there's no need to "even out the ratios". This isn't baking
Tire diameter is what needs evening out.
275/35/20 is 27.6 inches. OEM front is 245/40/19 which is 26.7 inches. You are nearly
one inch taller than stock
I suggest either:
275/30/20 F, 315/25/20 R
or
285/30/20 F, 325/25/20
This is given your desire to run a good amount of tire in front.
Most folks run 265/35 F, 305/30 R in 19 inch sizing
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