Not a chance in hell of BoA taking an 80 percent loss *and* deleting. The 20% strategy is for Collectors, not OCs. Collectors (or JDB's if you prefer) typically pay 3-5% for bad debts, which is why they can usually be convinced to take the deal - they are making a profit by doing it. If they end up having to sell the debt on the secondary market, instead of choosing to deal with you, they will get 1-2% for it maybe half what they originally paid.
I would recommend offering an OC PIF for a deletion.