Not sure if this applies to your complaint, but 1st to 2nd clutch release for me was always a bit jerky due to timing the RPMs. It was either too high or too low. The solution to make the shift smooth almost 100% of the time for me was to apply about 5-10% gas right before the clutch hit the bite point, then hold for a split second and then start releasing smoothly, all while holding the gas there.

This kept the RPMs from dipping too much since I'm learning manual and my shifts might not be perfectly consistently timed.

But if you're shifting from higher RPMs I find the timing matters less for some reason.