Trend Engine: AI-Powered News & Trends

We want to larger A/B tests on our landing pages, sometimes with major changes (i.e whole blocks, sections being completely rewritten) in order to optimize our on-page conversion.
At the same time, our page is ranking very well on many keywords we target, and we would hate to lose our place because of an experiment. Our current setup cloaks the tests from Google, but we’re afraid that it might be a very bad practice.
How do you reconcile SEO needs and the need for experimentation?