I don’t know that anyone is using aftermarket/race springs in their Hondas. Stock springs are great and durable.
Definitely check the smoothness of the clutch cable as Robbie said. I also found that changing to the Royal Purple gear oil improved my shifting smoothness and quickness a bunch. At Blytheville on the practice course last year I and everyone watching thought my motor wasn’t shifting. Turned out that the new oil made it so much faster than it had been with the SynchroMesh I had before. Only Royal Purple for me now.