Those are decent quality tires, you can try increasing the pressure a bit but it may make the ride too uncomfortable. The higher pressures you refer to are for thinner tires. When the rear tire tread wears out you may replace it with a 38 mm wide one.
For long wheel life take the bike back to the shop hand have them retension the spokes as they settle in during the first few rides. I dont know what the construction of your rim is, but double walled ones are much more robust. If it doesnt keep its shape, get your shop to replace or rebuild with a double walled rim.