On both my sets, the A’s are sharp. Can this be because the humidity is way up, or just coincidence.
One is a D set, the other a C set. It’s not way off, but just enough to have to lower the pressure when playing the A.
Otherwise everything is sweet!!!
Anyone else experience this?
This is how I think of humidity affecting reeds: When humidity rises, the cane takes on moisture and swells. This decreases the internal volume of air in the reed, and could raise the pitch of certain notes.
Have you tried adjusting the bridle to open the lips a little (and increase the internal volume)?
On the D reed, it is pretty open. Pretty tough to play. The C set was a little bit easy, but perfect now.
I could just tape them both. So close to perfection with both. Except one flat F# on the D set barri reg,
I was just thinking that what are the chances of both having sharp A’s. Mind boggling 
In my limited experience I’ve found that the A is a pretty pressure-sensitive note. When I’ve played someone else’s set the A stands out as being off since I was used to the pressure needed on my own chanter to get an in-tune A.
If you can’t change the reed, only thing to do is opening the blades.( or work with the tuner, if possible)
If you can make your own reeds, try a little wider head, BUT:
- the back D can get weeker, and the highest part of the second octave more difficult to catch.
You then have to make a wider staple.
If the reeds are to sharp, make it a bit longer.
Some other notes can be affected. The whole question is about the balance between head and staple.
What I take for certain is that everything can be fixed with the reed. The chanter is not that much responsible of the trouble.
Everything is back to normal. Just the weather!
It was super humid last week, now slightly damp. 
Pipes are very happy now.