There's this phenomenal app for font conversion called Webfont Kit Generator. The feature I like the most is Subsetting, it greatly reduces the file size. You might find it useful.
For the unaware, what about Google Fonts is a privacy leak?
Given Google's business model, I personally don't have a reason to trust them with my visitor's data, no matter what they do with it. Self-hosting the required fonts is a 2-minute job anyway.