bit baffled by this
wasn't the car originally fitted with the same size tyres at both ends ?
if so the 235/30's are fine , your speedo will under read by 2% which is just fine , presumably the sensor is off the front end , will normally over read by 5-7% oe
but why the 265's? they will be 5% out ...presuming this is 4wd I wouldn't consider this difference even if it didn't affect the balance of the car ; presuming you have the same width rims front and rear one size is liable to be outside the permitted width for the tyre anyway
with regard to pressures , get your axles weighed in your normal running condition , then contact the tyre manufacturers , give them the loads and they will quote you pressures from their ETRTO charts as a base pressure to work up from
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