'07 Accord A/C vent temps differ

I have an '07 Accord LX with standard A/C, not Climate Control. Bought
the car in January. The temperature of the air blowing out of the left
vents is nowhere near the temperature of the air blowing out of the
right vents. When driving 40-60 mph for ten minutes, the right center
vent blows air at 40 deg., the left center at 60 deg., the vent by the
drivers door at 75 deg., the vent by the passenger window is closed
(trying to get more cold air on driver's side), system on Max A/C (air
recirculates), temp control on coldest, and fan speed about medium.
This huge difference in temperature between the vents does not seem
right. Am I not waiting long enough for the system to do better than
that? Does anyone else with this car have the same experience or could
there be something wrong with mine, in which case I need to have it
checked by the dealer? It was a mild New Orleans day when I took these
readings. I've driven a '72 Cutlass, my only car for 35 years, with an
underdash A/C unit and it has always blown darn near the same
temperature air across the coils from one end to the other. What's
wrong with the Honda? Is this a fair comparison? Thanks, guys, for any
comments. Norman