THe taping process is different then taping for an ankle. I have injured mine a couple of times and the inserts are a waste, stretching does little, and rest (well, I just didn't have the time to rest).
I searched the web and found the following site that explains the injury and has a link to tape.
http://www.nismat.org/ptcor/plantar/
Results were immediate for me - no pain while my foot was taped, but still some in the morning until i streched it out a little.
Like the initial poster, I too modified the way it is pictured, and found a method that worked a little better.