I have the instructions for a Kadet in my sweaty mitts right now. Here's what it says.
To balance at 27%of wing chord go 3 1/2 inches back from front of wing.
to balance at 30 % of wing chord, go 3 7/8 inches back.
to balance at 33% of wing chord, go back 4 1/4 inches back.
27% is best balance for beginners. 30 % is good middle of the road balance and 33% is recommended for more experienced fliers.
I hope I helped you.
Derrick