Pilot of a homebuilt light aircraft reported minor damage resulted from a ground loop following loss of directional control on landing roll.

Narrative

Ground loop at low speed on landing. Minimal damage; aircraft was repaired and flown back to home airport the same day. No injuries to myself or passenger.The S10 is an aerobatic tailwheel aircraft. I consider this pilot error on my part. Conditions weren't hard or easy; it was calm wind; thus highest landing speed but no crosswind; on hard surface; not grass. Gross weight was below max but with a passenger.This aircraft requires fast and careful technique towards the end of the landing rollout to prevent a ground loop. It has a tandem bench seat that can be flown from the center when solo and to either side when carrying the one passenger. The visual picture is different; in particular determining what direction is exactly forward. My recent experience flying from the left side with a passenger was weak; though I had deliberately flown from the left recently; repeatedly; in preparation. And had recently carried a passenger. I have a telltale indicator on the cowling indicating the forward direction seen from the left seat; as I knew this is important for this plane.Thinking back of the landing; I had not been paying attention to that indicator; and had not been using fast and correct enough technique on the rudder pedals to maintain stability on a hard surface runway. I would call that overconfidence from ~800 landings in this aircraft. I will also be re-checking the alignment of the mains axles.