Consistency by Laminar Research is definitely not their forte. In 11.25, I used to override the throttles by setting a "1" to "sim/operation/override/override_throttles". Upgraded to 11.30 and now a "1" DISABLES the override...
Also can't control left/right brakes: it's frustrating to have to keep trying and trying (and then things changing on us). The description of the list of datarefs found in many other sites, is very inaccurate.