Best time of year to find under radar/underrecruited players

It seems now it is so late in the recruiting season that SMU just needs to look at a lot of players that have no offers or no FBS (D1A) and they can get a commit almost on the spot if they offer because they know it might be their only FBS (D1A) offer. SMU can load up on these types of players and not a to spend time recruiting players with multiple FBS (D1A) offers. Just go to some high profile schools like West Orange Stark and Collleyville Hertiage then ask the HS coaches who has not been offered that is pretty good then offer. It saves time recruiting.