Can someone explain how the graph works?

[keyturbocars]

Volvofarmer, It does sound like your turbine might have been running fast because your Classic was in absorb mode and allowing the voltage to climb as the amps were lowered.  The way I do it is to keep my Classic in bulk mode at all times with the way I programmed the Classic charge voltages and by diverting power to heat water.  This keeps the turbine loaded down at all times and maximizes the power output.  Sounds like your set up is very similar, although it sounds like your 1kW diversion load might be undersized for your 10' axial turbine.  If you are in a big windstorm, perhaps you could also use an inverter to power some loads and keep your Classic in bulk charge mode (and keep your turbine loaded down at all times). 

Edward