Is it a good idea to match up the M6 and the Bigfoot coil....can it be done? I know it can for the MXT. Would the match up cause problems on dry sand beaches with a fair amount to trash on them? I'm worried about missing good items under the coil as there may be more bad itmes under the coil at the same time..... thus cancelling out the benefit of the 18 inch coil. What sweep speed would be needed? Has anyone used this combo....what do you think...put in some suggestions if your so inclined. Thank You.