I found the solution! :)
I simply add an event to the PdfTextElement (BeginPageLayout) and in the method that's called by the event I simply request the page's content to start at 0,30 (X,Y).
PdfTextElement element = PdfTextElement("Some text", someFont);
element.BeginPageLayout += new BeginPageLayoutEventHandler(BeginPageLayoutMethod);
PdfLayoutResult result = element.Draw(page, new RectangleF(x, y, width, page.GetClientSize().Height), layoutFormat);
private void BeginPageLayoutMethod(object sender, BeginPageLayoutEventArgs e)
{
RectangleF bounds = e.bounds;
if (!e.Page.Equals(_page))
{
bounds.Y = 30f;
}
e.Bounds = bounds;
}