I recently bought a DUI CLX450 with Rock Boots. I am waiting to order the boots because I was hoping somebody else could enlighten me with their experience. First of all, I have size 12 feet. Do I order size 12, or one size up? Also, does anybody use these with their XL Tusa Tri-Ex fins? Do they fit or am I going to have to buy new (bigger) fins? Thanks in advance for any knowledge.