Shifter not smooth?

[tawheed]

So I've had my 02 Boxster S for a few months now and I must say something doesn't feel right with the shifter..

There is no grinding sounds or anything but sometimes it seems tough finding certain gears, usually third or fourth.

I replaced the transmission fluid a few days ago and it feels a bit smoother but still the same toughness can be felt. I have about 32k on the car and am wondering what the usual culprits are? I've driven a few other Boxsters and don't remember them feeling this way.

As per always, any insight will be appreciated.

Thanks