Countrywide Home Loans officials say the company will continue to securitize excess mortgage servicing spreads as a way to reduce earnings statement volatility. The California-based lender was the most active user of a tool that has so far been available only to large lenders: taking portions of its future servicing fees and packaging them as an interest-only strip security. Countrywide did three such deals in 2005: two were purchased by Fannie Mae and one…