Hello Jamie, it's been a while since you posted your question, but I thought I would share a thought: your 5E lesson plan can span multiple days! I teach in a middle school with longer classes (85 minutes a class!) and even then I don't get through everything I want. Maybe consider engaging the students on day one, exploring day two, creating their own explainations on day three, you explaining on day four, then evaluating their understanding day five. It's a cool way to make one science lesson feel like a real investigation.