Thanks. If you are able to make a recovery that exceed the debts under your bankruptcy then you can apply to annul the bankruptcy which would remove all records of the same from public record. In terms of your questions, using the same numbering:
1) As you have been made bankrupt, strictly any recovered funds, and the right of the claim itself belongs to the trustee in bankruptcy so any payment should be made to him or handed over in full. The trustee may agree to a more flexible approach in practice. That said, any amount over and above what is owed to creditors and in fees would be returned to you - it is not lost.
2) Any fees would be deducted from your assets overall including the proceeds of any recovery I regret
3) All fees associated with the bankruptcy or annulment of bankruptcy would be deducted by the trustee prior to returning any unused funds, or demanded from you if you receive payment and did not hand over the whole amount.
4) All such payments should be made through the trustee. This is because once made bankrupt you lose title and right to deal with assets in favour of the trustee. In terms of problems, if there was more than enough to pay off all creditors and you did so yourself despite the above, the trustee would in all likelihood take a pragmatic view providing his fees are also paid. Problems can arise if there is insufficient money to pay all liabilities as in these circumstances monies must be paid in a particular order and proportion.