slsa is only to make bubbles, like you average shower gel. The reaction you describe is from the reaction between the baking soda and the citric acid. Can you tell me what your recipe is? Other things may contribute to what you are describing.
I would make one with ONLY baking soda and citric acid, perhaps some fragrance, and test it. You cn make bath bombs with just those two things.
Here are a couple of videos that may explain better.
without slsa
[ame]https://www.youtube.com/watch?v=MlhvcGoo1Ls[/ame]
[ame]https://www.youtube.com/watch?v=8hxv77FjOIs[/ame]
with
[ame]https://www.youtube.com/watch?v=lFMS_RBcgEk&t=4s[/ame]
[ame]https://www.youtube.com/watch?v=GPXh5fSeDLM[/ame]