I overclocked my g-card and got the same behaviour that oc-speed in menues but when game loaded it went back to stock clocks.
That was with the MSI Afterburner.
I then tried a different oc tool - Sapphire Trixx and then the clocks stayed even in game.
I use ATI Tray Tool to see temps and clocks in game (with OSD).
Dunno if this helps any but seems you've tried most other stuff.
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