I found this 7 minute clip of Christian Tissier Sensei giving a very interesting ikkyo lesson.
If you like what Tissier does, here's a break-down of Ikkyo from Shomen uchi:
He doesn't directly show how to solve your pinning problem, he just focuses on the entry, but maybe that's enough.
Hopefully it's interesting anyway. Subtitles are available if you can't hear it so well.