Mate the crankcase breather filter is a real Knt to get on and it blocks up real quick , my solution was running a 12mm fuel hose off the outlet , running that up back of motor and under tank , it reduces to 8mm ( or 10 ) 1/2 way under tank then plugs into the back of the front filter , havnt had any issues with that setup whatsoever.
If you want to take a ride down the Goldy on Sun this coming weekend to have a look let me know. You can check out the airfilters as well.