I'm thinking in the range of 90 PSI rear, 50 PSI front, based this article, PSI Rx. Here's how I worked the numbers.

Based on your weight of 245, 20 lbs of cargo and a 30 lb bike (the Allant's a nice bike, BTW) you need to work from 295 lbs total load. With a city bike like the Allant, it's safe to estimate 65% of the weight on the rear, figure 190 lbs. I interpolated between the 32 and 37 mm lines, then extrapolated beyond the 70kg/154lb range. That left 35% (105 lbs) on the front, interpolating again, I get about 50.

I've found this graph to be a useful starting point. I experiment from there.

You can also see from the article and graph that narrower tires would probably be a mistake.