Someone found us a few minutes ago with this search.
If you’re still there: the answer to your question is almost certainly yes. Claims aren’t won by boring the tribunal into submission. It’s possible in principle that your 50 page witness statement is all relevant to your claim and all needs to be said – but it’s awfully unlikely. Most pieces of writing will be improved by being cut by 25 to 50%. If you can get your statement down to 20 or so pages, you will probably improve your chances.