That’s really weird. I have tested WordAI and Spin Rewriter with Copyscape and the results were always 80%+ uniquness, even 90%+. I don’t know how u spun the content to achieve such low results, but this is definitely way too bad. As for the block spinning, I have to be honest, this is the first time I’m hearing of it and I will have to check it out when I have a bit of time, but generally, yes, in the best case scenario, you would manually touch your Tier 1 content to make it 100% human readable and as unique as possible. For lower tiers, you can do pretty much anything, but again, the better quality of content, the better results you will have. That’s in my opinion and experience.
These days there are a lot of article rewriting softwares and it is pretty hard to choose one that will suit all your needs (quality + price – no subscription at least). When you will look for example at WordAI article spinner – you will notice that there is pretty expensive subscription (50 dollars per month) while spinnerchief costs only 77 dollars per year (which is about $6.5 per month).
In this day and age, it is by far the one of the hardest tasks to do online always coming up with fresh content for Google to devour. I love how easy Spin Re-Writer makes it for online marketers to get on with their business and not have to worry about the big G penalising their sites. Of course it's not just about fresh content, but it is certainly a big factor. Thanks Aaron and the team...:) 

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"It is my pleasure to give testimonial about this spinner tool. I think this is great and highly recommended tool to build a many unique articles for our internet marketing world. At the first time, I already see about another great spinner tools, but it is not free. And fortunately for me, I found spinnerchief. The free tools which have almost the same quality with another cost spinner tools. I already use spinnerchief to build many articles to attract traffics for my below minisite"
Using our online paraphrasing tool, you can rewrite unlimited content without any limitations. There isn’t any word or query limit. You can spin the article spinner as many times as you want. All the words or phrases which are replaced by our paraphrase tool are highlighted in different colors. You can click on any one of the highlighted words to get the detailed information including original word and suitable suggestions.
Millions of people who also have the internet at their fingertips are wondering exactly the same thing as you right now: How can I make money online? How can I get search engine exposure for my website (or blog)? What will give me a leg up on the competition? Thankfully you have already arrived at the answer to all these questions. Article Rewriter Tool is available for free to make your online business as successful as possible, with minimal effort on your part.
You have seen this type of article before - e.g. "10 Tips To Lose Weight" The key factor about this type of article is that each tip (each paragraph) makes sense in its own right - independently of the rest of the article. So if you can get a bunch of these paragraphs together, then you can mix any number of paragraphs in order to make your new article. The SpinnerChief TIPS plugin will do this task effortlessly for you. Check the details by clicking here