Oh yeah, almost forgot... I used to own one and just like the others are saying, that is "not" normal... Shifting around 8k should be just as smooth if not smoother than shifting at 3 or 4k
Could just be your driving too, make sure your seat is close enough for your foot to "fully" push the clutch in, do you know how to double clutch? if so you should be using that to your advantage. and you could have just missed the gear.