Chart doesnt show what i need

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Hello,im kinda new in this are and wanted some help if possible.
In this code ive tryed to implement a formula, but charts doesnt show what i wanted :(

the grey dashed lines when they overlap from next point should start a more thick line,but instead of that the line from the start becomes all thick (example:dashed line about 3'',then thick line another 3", then again dashed line etc. in this way should be, but shows all thick )

Also possibility to move these line appeared,really dont get how to make them immovable

Sry for my bad english and I hope someone can help me in this code