Parker medium rollerball refill: does it have to be scratchy?

Hello,

I tried two Parker medium rollerball refills and was very surprised to
find that both of them had an awful scratchy feeling. It's not that
they tore through the paper, of course, but it felt that it was not
the ball only that touched the paper but the metal part around it as
well. As a result, both refills were basically unusable.

I hold the pen at about 45 degree angle. Is it possible that they are
intended to be held more vertically? Or was it just bad luck? Are
there any refillable rollerballs that you could recommend for having
the feel similar to fountain pens?

Thanks a lot,
Evgeny