1. Do not send multiple CSE. If you cannot fit with the 3.5 MB, send your proofs using courier. If you use courier, you may send a CSE mentioning the company used, the tracking number, and a brief list of what you are sending.
Send a proof he is the owner, the management list with both your names and a short letter explaining the condo was bought way before you knew each other.
2. Good, it's a plus.
3. You can expect about 45-60 days before they acknowledge they received your documents.
Your list of documents seems to be strong. You might also send a copy of your spouse driving licence in addition to yours, with both showing the same address.