Spring perch offset
The installed position of the spring on its damper, used to fine-tune the height of each corner of the car. Kept symmetric across an axle it adjusts ride height without disturbing the diagonal weight distribution; moved in diagonal pairs it is the standard way to adjust static cross weight. It is the mechanism behind several other settings — after a spring-rate change the perches typically need re-adjusting to restore the intended static heights.
Effect by corner phase
Through its effect on corner heights and cross weight, the perch offset shapes how evenly the car takes left- and right-hand corners.
Symptom tendencies
These describe tendencies, not rules.
The car behaves differently in left vs right corners of similar speed
Check static cross weight first — asymmetric perch settings are the usual mechanism, and small diagonal changes tend to move the balance visibly.
Verify on track before you commit to a change.