Fred,
Are you getting growth lower down on the trunk that you're removing? The Seiju sprout all over even on much older wood sections. Like Omono said the problem is to keep up. Perhaps the corticosa do that less?
Ian
p.s. I like your tree!
My seiju puts buds out of the trunk without touching a thing. I let it grow untouched last year and buds still grew out of the trunk. It's what they do. And if I cut a small branch off a bud will show up for sure. Hell,if you expose the top surface of a root to the sun a bud will grow there. It's an all year round job rubbing buds.