chances are the bubbles are coming from when you put the trim around the bottom... i noticed when installing spike's that when we would push the trim on, it would bunch the bottom of the bra up some and cause bubbles.. if you can get a second person to help you install it, have them hold the bra flat while you put the trim on, other than that, try to install it after you have been driving for a little while so your hood is nice and warm, that will help the bra mold to your hood

just a friendly reminder.... wax your hood before installation! i would recommend using a "real" wax (as opposed to ice or another liquid synthetic wax) to help protect the hood in the event of a small bit of water or dust getting under the bra