Fannie Mae said it would correct the payouts for investors in over 150 pools of loans affected by a mortgage fraud scheme – but it’s not saying much about how it will try to avoid further problems. A GSE spokeswoman confirmed last week that the firm’s decision to restructure payments related to 234 loans in 169 pools of mortgage-backed securities is connected to a recent lawsuit filed by Fannie against the Olympia Mortgage Corp. According…