I was thinking about something similar -- to make part of the question be sufficient information that the LLM can find the limerick. Then the 2nd part would ask something that would require a deeper understanding of the limerick (or other text).
I had the same experience. With a 16k prompt, Turbo was nearly flawless. But it wasn't very good at 32k and not usable at 100+. You have to repeat information to get good results with longer prompts
What version of Gemini is built into Google Workspace? (I just got the ability today to ask Gemini anything about emails in my work Gmail account, which seems like something that would require a large context window)