9 hole draw on suzuki manji

I have in the key of c a hohner special 20, hohner cross harp, and a suzuki manji. I have no problem with the 9 hole draw on those harps and some that I have in other keys. However, when I use the suzuki manji, I get very a little if any sound from the 9 hole draw. I have tried to make different adjustments in force of draw and lip position. At times a get a little improvement but never a good tone. Any suggestions would be appreciated.

My guess would be to check the gap of the reed. Look at the other harps of the same key and compare the gap to the ones that work and make the Manji the same.

I just took your advice and gapped the reed. It’s not perfect but did make a big improvement. Thanks for the advice!