Great set. First one that is actually Tangoish and 3x better than original. Like in mat icon set, you used a lot of mimetype icons which is fantastic
My fav for you awesome work.
My opinion at the end: you could create one small set of additional icons. Like 22x22. Im suggesting this because on panel 48x48 svg icons can be blured somehow. I must say that you developed great icon set with great idea. Thick borders are good idea since they can "compensate" look of icon in small sizes but usually (and actually) it can not do that.