a leak from crank case breather tube

[2007pologti]

Hi,
I own a 2007 Polo GTI, and recently I changed a pcv and related hoses to solve P0171.     
After installation, I did a smoke test for vaccum leaks. And I found a leak from a crankcase breather tube 
The crankcase breather hose I bought is not VAG genuine but BBR/COOLXPERT brand. 
t seems that the original c clip the part # 037121142A ( steel wire version)does not press down enough the new crankcase breather tube.  Do I need a new clip ?  Am I missing any? Did I purchase a bad quality Crankcase breatehr hose?     Or is it better to use a different design clip? 
VAG offers a different design c clip for 1.8t 20v motor, the part # 06b121142A , flat type. 
TIA
Jack