The manual says that the high output jacks 5 and 6 put out 250 mA max - is that each, or combined. I plan on powering a TC Electronics Nova Delay and a Strymon Ola pedal, the latter of which is 9v and 250mA minimum.
Also, does switching these to high voltage output decrease the available mA? The chart in the manual is a bit vague about this.

These outputs are 250mA each.

Switching output 5 and/or 6 to unregulated mode (12-14.5V) will not not decrease the available current (mA).

Note: For your Strymon use regulated 9V settings only. Do not power your Strymon with the unregulated settings (or at 12V).

To power your Nova Delay use Pedal Power 2 Plus output 5 or 6, DIP switch set AWAY from NORMAL with one of the all black (standard polarity) cables supplied.

To power your Ola use Pedal Power 2 Plus output 5 or 6, DIP switch set NORMAL and one of the all black (standard polarity) cables supplied.