PIP Tribunal paperwork question

I'm preparing for a PIP tribunal next month, and I note that the DWP has said I submitted nothing relating to the specific indicators where I feel I should have been awarded extra points. I submitted a huge amount addressing individual indicators (including citing relevant Upper Tribunal decisions) when I made my request for mandatory reconsideration. Actually, I sent it all twice, as they conveniently "lost" the first request I made, despite me sending it Special Delivery which showed it as delivered.
I assumed that because everything I've sent the DWP is included in the bundle, I didn't need to send it all again.Was I wrong? Should I send everything for the MR to the Tribunal?
Unfortunately the only advice I get is "Go to the CAB". I can't, because our local CAB is not very good, because going out at all is a migraine trigger for me, and those migraines can last 14 days, and because my autistic husband had a bad experience there and it's become a trigger for him. Because he has some legal background, he'd be massively upset if I get someone else to represent me. Problem is, though he'd be great handling a criminal case, he knows zero about tribunals. I'm feeling stuck and frustrated.
Anyway, if anyone can advise if I should send additional info to the tribunal in advance, I'd appreciate it. Thanks!