I don't know about gamma, but in WiiFlow you can just go into the game options before loading a game and set Error 002 Fix to ON and you should be fine.
4.2U || BootMii beta 4 (boot2) || DVDx v2 || HBC 1.0.8 || cIOS 38 r17 || WiiFlow R254-249 Carbonik || Triiforce MRC SS || MPlayer CE 0.76 || WiiRadio 0.4
Patriot 16GB SDHC Class 6 || 500GB Seagate 7200.10 in NexStar CX eSATA
Triiforce MRC User Guide - How to Load Wii Ware from a USB Drive or SD Card
Stomp_442's guide: How to install Hermes cIOS 202, 222, 223 and 224
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