This is a great location to get assistance! I read your post and see that you are getting ghost touchscreen issue.
As you have already tried these steps and still having the issue, I would personally suggest you contact our HP phone support for further assistance. If your product is Out of warranty then remember to choose the paid options to get the tech support number.
They might have multiple options to help you on this.
Please use the following link to create yourself a case number, then call and it may help speed up the call process: