More Chorus Depth

[Thelonious]

Hi,
I build this kit : http://diy.musikding.de/wp-content/uploads/2013/12/angelschalt.pdf
But I found it has not enough depth, it's very "light".
What can I change to have more depth (a pot, a resistor..) ?
Thanks.

[IvIark]

Reduce the 33K resistor

[Thelonious]

Thanks IvIark