As a guide you should generally expect a 1 psi change in pressure for every 10 degree change in the tire temperature. Note that under normal driving your tire temperature will be 10-20 degrees higher than the air temperature after several miles, and under aggressive driving it could be 40-50 degrees higher.
Try dropping down to 40 all around and see how it does. With the stock metal valve stems I haven't seen any pressure loss at all, just fluctuations in pressure due to temperature. With cheap rubber stems you might lose a tiny bit but probably not enough to notice.
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