Whilst I was gone for what was almost a month, I got some replacement mouse feet for my G305, they're CorePad Skatez and are made of pure PTFE, which in theory yields great gliding results.

I'm at least 168 hours burnt into wearing these in, and they don't feel an awful lot different. Although, I am using quite a rough mouse mat to begin with with high friction, so I feel the feet might be suited to a weave that is more loose. At least these make my mouse essentially all-white though!