I have been working on a research paper to apply a technique X to solve certain problem Y. The field is in computer science. Approximately some months ago I started to check it up if there was something similar to my proposal, but I did not find anything at all.
A couple of weeks ago and when I have already finished the tests for my proposal, I decided to check it up again. In my new search, I found an article that was published about two years ago and when I read it, I saw that it was very close to the idea on which I have been working. The differences were very subtle, I was using a simplified version, data was collected in a different manner, and other tiny differences. If we talk in percentages, the differences would be like 20 % between my article and the one I found.
The reasons that I did not find this article in my first search were that it was published in a not so well known journal, and while it has been cited before, it were only self-citations and there was no strong relation between the article and the citing ones.
So what I can do in this situation? I have not based my work on this paper, but I know that I must cite it like a related work. Should I drop my paper or present it and see what the reviewers have to say about it? I would not like to be pointed as a case of plagiarism because of the similarities.