Any suggestions for bring up a flat C# note? The Cnat is fine. The back D is a little sharp (corrected with tape), but the C# is constantly and noticeably flat.
The chanter reed may be the problem. I’ve had other reeds in the chanter which sound much better (the C# is still a little flat when measured with a tuner but by ear I can get away with it).
Any thoughts? Adjust the staple eye? More scraping?