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You might first try skipping the WTG on that area, and instead going XTG from top of windpipe down towards shoulder at about 45 degrees. On the next lathering, go XTG from bottom of windpipe up...

If it's skipping on the first pass, then you may not be going WTG as you might think. Generally, if you try going ATG (or sometimes even XTG) on the first pass you will get this trouble. You might...