I have a 21,17 set up on my Glide, have not lowered he front and like the ride very much, my ife likes it also, slow steering is a different experience, I call it "the bars get heavy " witch is understandable with the ncrease in size.
As with all mods ride it slow and easy as you get the feel.
If your like me you will love the ride with out lowering the front.
SE Heavy Breather,D&D 2in1 Fatcat, SE 255 cam's SE Tuner,21",17",Renegade Phantom Cut Whistler,HD Edge Cut Grips,Mirrors,Levers , Etc. 12"Yaffe Monkey Bars 13" LRS