Hm...I don't use that brand, but I might be able to help?
-Try checking your pen nib. If it's too short and the point is flat, it may affect your drawings since it the nib would have lost its touch-sensitivity by then.
-What drawing programme are you using? Different programmes have different settings. Some have automated smooth stroke to prevent the jitter, whereas some needs you to set them yourself. Try searching for the setting smooth stroke or antialiasing in the brush setting. Experiment with the value a little, and find the one you are most comfortable with.
-Or maybe you're just trying to get used to drawing digitally. Everybody has this awkward shifting phase from pen and paper to pen and tablet. There's no really any cheat to this though, just practise and develop a muscle memory for it.
I hope these can help you.