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I'm not sure about your radio advances, but it looks fine. Turning does not advance the frame. The only way to check your seed is to catch a wild pokémon.
I'm sorry, but I'm bogged down studying for an exam tonight. I'm going to let everyone know that Wednesday will be my day to complete all of my pendings. Sorry about the delay.
The explanation is still logical. Doing all of the steps you took, you would get a frame of 17. So you're going to have to tune/detune the radio once before you enter the cave, I suppose.
EDIT: Beaten.