I can not see what sources you are useing and there is some messy code in your post that you would not want to put in the profile (stuff like <!--[if !supportFootnotes]-->)
Whilst there is nothing to stop you editing the profile since you have done the pre 1700 test If I were going to make changes to a profile like this I think I would speak to the profile owner first, really just out of courtesy, and since one of the owners of this particular profile is a project then it would make sense to me to speak to the Puritan Great Migration Project although it is not strictly necessary if you are happy with your sources and can make a tidy job of it.