Because of the light weight of the shavette, you will have to do all the work yourself. Having said that, the blade is sharper. So the culpret here is most likely your prep and/or technique.
Prep is easy, hot water and lots of it, followed by hot lather.

As for technique, take the shavette almost flat against your skin, and play with the angle from there. do not apply any pressure, just let the blade do the work, and try to remove the lather. It's okay to do several passes, when you get your angle right you'll know it, and the hair should just fall off of your face.
Next do some reading on skin stretching.

hope this helps.