I find stuff I've missed at a site I've hunted before, using the same detector. Congrats on the new detector, my hunting buddy who just started this year has an F2, he's doing OK.
I have noticed the same thing, even with the Ace 150. Many times I have hunted the same spot at different angles and have found stuff that I missed before. My main problem with the 150 is the target seperation and target reset is very poor. If there is any iron nearby, forget it. That's why I am excited to try the F2.