Regarding the large clearance between the front tire and the fender - Be conservative about decreasing the clearance. If there is very little clearance between the front fender and the tire, and a stick or some other debris gets flipped up by the tire and becomes jammed between the tire and fender, you are probably going to go down. So if you do lower the fender, leave enough space between tire and fender (like maybe 1 cm ?) for safety sake.
Regarding the mounting problem - I went through the same sort of hassle when I mounted fenders on my do-it-all bike (a Klein Pinnacle) and I ultimately had to make my own extenders and braces to attach the fenders to the bike.



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