yeah the heads are the best imo... when i have a shad thats like 3-5 inches I will cut the head off, then cut the tail off. that will make two good sized baits.. the head usualy gets hit faster... if I have a huge shad I may still use the head, but i will either filet it on each side, or cut it into 3rds and on the last part I always cut off the tail (dont know why, just dont like to use it)
Lately however I have found live perch in the 2-4 inch range are working better.