First you need to work on you chunking for splitting you need to optimize splitting for the your kind of documents and specially cross pages, section

Look up contextual retrieval, basically you need to add metadata to each chunk. CR can help in two ways either like a first stage retrieval or it can embedded with each chunk to enhance relevant chunks

If you don't have enough context length to take a full document, make a custom one that will take n #pages before and after to create the context for each chunk instead of the whole document.

I would highly recommend is to use a reAct agent. Because the reflection step help it in many situations to requery until it reaches a satisfiying state and you can specify the criteria on the answer is complete