Portafilter that isn't so tight with Bambino Plus?

Looking for a 54mm bottomless portafilter that doesn't require holding down the Bambino with great force just to get it in. I'm currently using a LILQ one from Amazon. I'd like to be able to just use one hand to put in the portafilter, or at least use minimum pressure with my off hand to get it in. I really have to hold down the machine to get it in and have been using this portafilter for 6+ months. The stock portafilter has similar issues, albeit slightly easier in getting it in.