All vehicles would have different psi recommendations when using the exact same tire.... and yes your tire is overinflated if its on a Ridgeline and it's more than 32 psi, even if Max. psi is 44. The tire manufacturers don't have a recommendation on psi, they leave it up to the Automaker.The tires can NOT be over-inflated when the MAX COLD PSI is 44 for the OEM 18's.
I base my air pressure adjustments on season, road conditions, and tire manufacture recommendations. The vehicle manufacture stamps the info on the door jamb as a reference. If using different tires with different load ratings you should follow the tire manufactures recommendation.