A well-known problem called Morton's neuroma. I've posted on this several times.
Wedges may be one of only several solutions. It may have provided relief for one person; not necessarily the next. From my reading (and I may be corrected here) wedges are meant to solve other problems related to knees and ankles.
There is a sequence of options to works through with Morton's neuroma. Shoe width and length, moving the cleats *back* (shock horror for the roadies), thickness of socks, tightness of shoes laces/straps.
One of the solutions is to look at Specialized's metatarsal insole that it is used on (most?) of their shoes. They seem to be the only shoe manufacturer to address this issue at the get-go -- in shoe design.
FWIW, long-distance cyclists can suffer badly from Morton's neuroma. It is trapping of the nerves servicing the toes in particular. Cutting off the feeling, if you like. It is caused by the metatarsals (or the small bones) in the front of the foot collapsing on the nerves.
Go see a foot specialist if your problem persists. It is evident from the posts here that few know much about this.
And yes, I am a long-distance cyclist who initially suffered severe problems in this area, and has explored several solutions. But the main one was the metatarsal button and moving the cleat back.