help with geode feature replacing hardcoded blocks.

i am making a cave with a large open area held up with pillars, i used the large dripstone feature because of its pleasing shape, but i want it replaced with a different block. it seems to be hardcoded, so i am using the geode trick to replace all the dripstone with bone blocks, but its not replacing all the dripstone like it should. the remaining dripstone seems to follow chunk borders, so i assume thats part of the reason, advice on how to proceed would be appreciated.