I have a concrete fountain with a frog which "spits" water to cascade
down several concrete "leaves." Water tends to dribble around the
bottom of each "leaf" instead of streaming down to the next lower leaf.
Water flow looks good -- any more and it would overflow. My wife has
tried putting silicone around the spout of each leaf, if anything that
makes it worse.

Can anyone help?

Thanks,
Marty