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Thanks
I have heard of many people going in and doing on page seo to a site that is already ranking and they lost rank. If you are doing well then be very careful and make changes slowly. The changes you talk about are very minor anyhow. Don't over do it.
Your not giving us very much information. Your idea of bad SEO might actually be good SEO. Be very careful what you read on the Internet much of that information is outdated. You can do one thing and hurt your ranking while another person does the same thing and they improve. It is not simple. Google seems to get spooked when you make a bunch of changes to a website.