I have been playing for a couple of months and use a Yamaha 4c with Rovner which works fine for me. I used a #2 for a while but (at the recommendation of my teacher) moved up to #2.5 and have been experimenting with #3 reeds.
The harder reeds make the higher notes much nicer sounding and easier to hit and don’t seem to make the low notes much harder to get.
I think using the #3 is helping my breathing .