@jcloudm It is hard to tell without access to debug data, as there are several reasons why such false data can occur, but seeing many spikes within your data does indicate that you are not protected from the most common issue with wunderground API: old data records.
I've implemented a fix in place for wufyi on March 26th (link), so you will definitely see a benefit from switching.
That being said, I am aware of a different issue which could result in false rain readings, though this is far more seldom and only a few people experience it, a fix for that issue is coming soon (I'm still testing it). I do not think that you are experiencing this particular issue, as it tends to effect several readings in a row.
So to answer your question, I'm pretty sure that wufyi is already avoiding this issue, but if it doesn't, a solution is actively being developed.