Take a look at these items in the Code Plug Hex file (through Hex Fiend) for channels 7 & 8 and 14 & 15, where it goes from High power, to Low and then Low to High:
It goes from 1 1 1 0 to 0 0 1 0; so perhaps one or both of those leading 1's are part of the HIGH power designation.
Oh, but wait, the Programming Software for the T11 already has the HIGH setting for all channels except for 8-14, which are LOW (see my screenshots posted on September 10th).
So maybe some other designator is needed to provide SUPER-HIGH power.