Hi Clare,
To me, 35 to the crotchet seems not only verging on the leaden, but rather impossibly slow. I listened to a few recording just to check my own intuition, and the slowest I could find was around 45.
I guess visitor is right when he writes keep experimenting until you find a tempo that is right for you. I would say anything from 40 to 60 or thereabouts would be possible. What do you think yourself?
Something you will have to consider is that the sixteenth notes shouldn't feel or sound rushed.