I was working on my company's site and tried a few different things with a few different pages. Not necessarily important pages to us, but just to see how the change would hit Google. Well, we changed a page's address and it has fallen 20 pages. We were expecting this, we have a re-direct set up and we know it will climb again in the future. Then we tried linking 2 extra pages to one of our static pages hoping to bring up the ranking, that ranking well back about 20 pages. We were not expecting this. We also tried H1 tags on a couple of pages, those pages too dropped big-time. Now our biggest key term which we did our best not to affect has fallen about 10 overall spots which is huge for us. Any explanations or help?