Then I would use another analytics system. However, most people now use Google analytics (I don't... and I moderate the forum!) and they seem to believe the data - do I would try to analyze WHY Google analytics is saying you are getting traffic that does not convert - it may be that the traffic is not targeted.
We had online resources (dictionaries) on our site. Over the years, some websites placed links to those online references increasing our traffic. However, increased traffic did not bring any additional business but hurt our business because G interpreted our site's overall theme in a way that didn't mean business for us. So, I deleted those pages, our traffic went down (almost one-third of what it was before) but our business volume increased as we started attracting less but right visitors. In your case, try to see what keywords/search terms are used by your increased traffic (in your GA statistics) and evaluate if your website is attracting the right visitors that you intend to. I would, of course, try to test ideas offered by others as well