For v_ctl_auto_throttle_cruise_throttle I'd just trim the plane out in manual flight then make a guess after looking at a plot of the throttle (vs climb) from the telemetry log.
For v_ctl_auto_throttle_climb_throttle_increment, try 0.1 for a typical model, more if it's overpowered/acrobatic (maybe 0.2) and less if it's overweight (maybe 0.5). Hopefully someone will explain a better method to both of us.
Chris Gough