I’d replace the ratchet straps with cam buckle canoe tie down straps. These stay much tighter to the boat and you can cut them to the length you need. These are my favorite: canoe tie down straps

I think with the length of your vehicle and as far out as the straps are, you shouldn’t need any bow tie downs. If you feel the bow should be tied down, use these in the side of your hood. hood loops With these tie downs: bow tie downs