I always make sure I start the cross under the first main so I end going over the last one. Also, as far as the frowning of the crosses, before I pull tension, I always push the string up, then pull. When I am all done the crosses, there is always still a slight smiley of the crosses, so i take each one and I just push it up and then each cross is perfectly straight. This has always worked for me and I never have a racquet with the strings slanted...
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