Have you adjusted the screw in the lever - shine a torch down from the front and there is a 2.5mm hex head bolt in there - if you turn it it moves the pads further in / away from the rim - the brakes will take a 28mm rim - i think your enve is about 26 - I run a 404 in the front which is similar width and it works fine.
You can download the brake set instructions from
https://www.magura.com/...6_rt8_2013_en_08.pdf
You can download the brake set instructions from
https://www.magura.com/...6_rt8_2013_en_08.pdf