How to make vanilla tree height taller?

Hello there, I am trying to make a simple datapack that changes vanilla tree generation (oak and birch) to make them taller.  I've modified the "configured_feature" json files, (copied and pasted from the 1.21.8 jar, and checked with misode's configured_feature generator) and placed them in the 'minecraft\worldgen\configured_feature' folder in my datapack.  I have some test functions in there, which use the "place feature" command that work fine, but the vanilla tree generation is unchanged.  I feel like I'm missing something obvious.  There is a datapack called "Heightened" for 1.19 on planetminecraft that inspired this, that I successfully modified to my liking in the past, but something seems to have changed since 1.19 and I'm having trouble figuring it out, even after checking the wiki and examining other worldgen datapacks.  Thanks in advance for the help!