A .75" is pretty little. For me to tuck my tires (14" rims) I have to have a 3" drop in the front and a 4" drop in the back (approx).. You might want to get at least a 2" drop front/back and maybe some 16's. Bigger size rim wont really fill the gap that much because as the tire gets bigger you'll want more lower profile tires as well (so the outside radius remains about the same)