Thank you for that @canna-curate!

And ok, I didn't want to do it immediately after transplanting them, because I figured that would stress them too much!

All I really want to do with the Ocean Forest is just "build up" the base of the plant to be a about an inch or two below the top of the bucket, so I hope I won't have to add too much! But thank you so much for the advice, and I definitely will keep the 2:1 ratio in mind when I do add the new soil!! :)