That is a very low dose. And it is long acting.

I find that Biofreeze is best for burning. I've used it for several years.

Some high menthol products do not work as well, but some of
our members have used Icy HOt as well.

Biofreeze is now available online for less money than before.
It is a non greasy gel that is absorbed quickly. I'd put it on the tops of the feet as well, as that is where the nerves are going to the bottoms. The skin on the bottom is pretty thick and less likely to work with creams/gels.

http://www.amazon.com/BIOFREEZE-Pain...f=pd_sim_hpc_4
This used to be only available from chiropractors and Physical therapists, but it has now generalized to everyone.
This price is one of the lowest you will find, esp with free shipping. It is really a nice product, and I was introduced to it in PT, years ago. I also use it on my knees when needed, but it is very very good for burning feet.

There are two types of temperature neurons in the skin. Hot and cold types. The gel Biofreeze delivers the menthol rapidly to the cold receptors which block heat ones, and hence the burning stops for a while. I find it effective for several hours.

You can also try soaking in lukewarm water with epsom salts.
This can also help. The magnesium is absorbed and blocks the burning that way.