Chicoine originally learned iron palm from Feeman Ong. His methods are just typical iron palm training. He was good, but I believe the members of the Iron Palm Society are better. They don't use half blocks or spacers.
Here is an old video of Gene Chicoine and his students doing breaking: https://www.youtube.com/watch?v=JB2hCsCRE14 Note the use of half blocks and spacers.
Here is a video of Shane from the Iron Lotus Society breaking full size blocks without spacers: https://www.youtube.com/watch?v=Y2UwxAcIWzg BTW, I was there and checked their blocks, without their knowledge, before the seminar to make sure they were not gimmicked. There guys are the real deal.