Water Heaters - Adjusting manifold pressure - pilot goes out with burner

I have a 2 month old Richmond water heater that the pilot won't stay lit on. I've searched threads and the explanation that seems to jibe most with the symptoms, given by Broods in the following thread, is that the manifold pressure is too high and it knocks out the pilot when the burner shuts off.
http://forum.doityourself.com/showthread.php?t=293852

There is an allen head set screw on the valve body labeled “press tap”. Is this the adjustment screw for the manifold pressure? The gas valve is a simple(cheap) Unitrol with no pilot adjust.

Adjusting the gas control valve is something which should only be attempted by a trained technician with proper gauges, etc. Firstly, you don't know that your gas pressure is too high, you are just guessing. "Fiddling around" with the gas valve could be dangerous.

On most (including your) water heater control, there is no pressure adjustment. If the pressure is too high, chances are it's too high at all of your appliances. A defective water heater control will not raise the incoming pressure, only decrease it.

The hex pressure tap is only a port to check the operating pressure of the water heater control with a manometer.

My suggestion is since the water heater is only 2 months old, call the installer or the manufacturer as it's under warranty.