If you're not happy with the F nib, you may be able to exchange it for an EF through Pelikan's nib swap service. You just have to pay the shipping.I think that the size of the pen is correct, but choosing an extra-fine nib might have been a better fit for my writing style.
If you think you may do this, I would contact Abbi at Chartpak/Pelikan about doing so quickly. I think you only have a few weeks or months from the date of purchase to take advantage of this service. I have used the service before with great results.