Thanks, this did it! I was using the wrong version of TCA.
Now if I could figure out how to get it to hover this thing...
Four radial aerospikes with a TWR ~1.3 when landing. I can get it down within a 2 km radius of KSC with 1000 m/s delta v left in the tanks, but I can't get it onto the pad or the runway. I would like it to land for a 100% recovery, and I believe it has the capability! TCA does not seem to be taking over throttle control when asked to maneuver in pad tests. In pad tests TCA does not seem to be taking over throttle control of these engines when asked to hover or follow waypoints. It points the nose in the correct direction to hover over to the waypoint, but does not ascend or descend without manual throttle inputs.
Action shot:
Sitting on the pad with TCA engaged. Auto-throttle is active but as you can see the throttle is still at 50%. The ship has the thrust for VTOL. The engines are default profile, classified by TCA as main engines. What do I need to do to get it to fly me around like a quadrocket?