The last years I used a vandoren v12 2,5. the traditional 2,5 was too hard and the 2 was too light. The v12 are a little lighter than the traditionals. Sometimes I try out different reeds and strengths but I always come back too v12, 2,5 because others are too hard or too light. In December I tried out different reeds again, v21 and 56 and a trad 2,5. They were too hard for me, but I saved them for maybe future use. The last week I found that my reeds v12 didn't last as long as usual. A member of my wind band said she moved to harder strength reed so I thought maybe it's time to try again a harder reed. So I bought a v12 3 and a trad 2,5. And they were playing easily this time. I also tried out the v21 and the 56 and these sounded right too. So since Christmas my embouchure has changed.
It is also since Christmas that I took up flute again. Could this have helped to strengthen my embouchure?