I ran a 285/35 and 275/35 Frt/Rr in an A/S tire, maybe consider those sizes. I used the BFG Comp2 A/S with no problems at all on the OE 1LE wheels. You have a little more option to depart in sizes from OE. Trying to get in these widths on a 30 profile is difficult on an A/S, but 35 series has a few more possibilities. In those sizes too I saw no deviation on the speedo. It was no more than 1mph off from stock speedo calibration.
I couldn't say why you don't mix manuf it's just a "rule". Especially on one axle.
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