Landing Pages are Constantly Fluctuating in Rankings - Is There a Reason Why?
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This is completely normal, especially in the deeper pages of the SERPs.
Focus on creating the best page you can about "borescope" and then building some external links to that page and you will see it climb the rankings and likely stop bouncing around between similar pages on your site.
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Definitely get some quality links to that page, and make sure that your content is helpful, unique and engaging. Try not to make so many changes so fast. Give your page time to even out after make changes. If you do too much to fast it will be hard to pinpoint what is working and what isn't. Start with the content, then the meta data, then the links. Sharing the page through social will help too.