I have been looking at a shark guard splitter. On their site that say that use should use a splitter just a little thinner than the kerf.
It is not a question of pressure - it is all about spacing.
http://www.microjig.com/products/mj-splitter/
I am not talking about the thickness. The splitters hexert different amounts of pressure against the keeper board and thar is the question I have. How much pressure is needed?