So my liner needed repaired. All done and refill completed. I slightly overshot my CYA and now it sits at between 90 and 100. Should I do anything or just let it be and await some backwash and water add?
Actually, you do want your FC that high. With your CYA so high FC must be maintained MUCH higher than if your CYA was at the proper level.....look it up in the chart in Pool School.
Let me also say that Richard320 is a meticulous pool manager and has a complete grasp of his pool and the methods by which to control it. Managing a pool with CYA as high as yours is not at all easy. I would strongly urge you to lower it.
Secondly, pool store testing verifies virtually nothing....regardless of technology.