alright man, i dont like to give out my tips at all, but here I go. I play the same exact type of defense all the time and rarely will you ever catch me in a zone.
Ight so anyways, when you're playin man to man and blitzin with bump and run, use your safeties to cover the flats by either using the blue zone or the purple zone(your choice & depends on what they doin). if you have 1 of your safeties back in a deep zone, then tell him to cover whatever side of the flats you are most concerned about, and cover the other side on your own.
Now say if both your safeties are lined up man to man because your blitzin your slot corners or somethin, then still you can audible both of them to check the flats, but be careful. Because it depends on if your opponent is sending any guys on streak patterns up the middle of the field to counter it. But if they are not, then all you have to do is guard the short middle of the field with your linebacker yourself.
Thats all Im givin you lol.