I don't know the Minelab Wiggle, might be the same thing, but it sounds more like using a shortened swing width. Let's say you swing the coil side-to-side that covers a swath of ground that's two or three feet wide as you walk along. To help pinpoint or "see" multiple targets, cut the swing way down to about the width of the coil or a bit wider, let's say less than a foot.
The technique I came up with is much like ground balancing in the old analog detector days. Think of it like a hand pump for a bicycle tire. The movement of the coil is up and down, up and down, instead of side-to-side. I found the coil has to be very closely centered over the target to make a signal. We can call it the Bounty Hunter Bounce, lol!
I've noticed it helps with IDing rusty bottlecaps that sometimes make a high-tone. When you do the Bounce, the tone drops down to iron, while a coin or good target still gives a high-tone.
Next time out, bring along a group of coins and junk like you normally find. Just randomly toss them on the ground and check their signal. Try the Bounce and the Wiggle and see if you can find the coil's sweet spot. It's easy since you see the target, but good practice. Do these tests with Disc off or as low as possible, so you can hear all the targets and note if bottlecaps change their tone when you do the bounce over them. Once you get that down, try it with increased Disc, or any other setting you're wondering about. Raise the coil while swinging to get a feel for how they respond when the coil is further above them, and so on.
With a little practice, you'll have a better idea of what the buried things you can't see might be before you dig.
-Ed