Running at Max Output...

I noticed with my Pioneer that after setting the high and low feed rates, even setting the room temp 10 degrees above anything
the stove could do, I can not get the stove just go full tilt, even though the feed rate when checked says 99.(coal trol )
Yet when I go to the set the feed rate, if displayed in the program mode, I can get the stove to heat up more. Does
the coal trol back down the feed rate as it gets closer to the set temp?

How are you determining "heat up more" when the stove is set with the "MAX" displayed on the coal-trol?
One of the things that may be different is when the stove is feeding at 99% of your max set temp the convection fan is also running at 99%.
When you had the stove in the "MAX" mode your convection fan may not have been up to speed (99) and therefore would have made the stove hotter by not washing the heat off as fast.

This is just a thought.

Gambler is right. When in the MAX setting the convection fan speed will slave to the setting. So if your MAX is set at 45 the convection fan will be running as if it were settled in at a FR of 45 in normal operation. This will result in less heat being moved off the stove, thus a hotter stove and hotter air blowing out while in the MAX setting (but less air being moved by the blower and more heat going out the vent/chimney so less BTUs going into the room air overall, and thus less efficiency).