I also think it is a wicking problem. Very common with new users using stock filler. I use the zero-filler mod (search in the Joye 510 forum), with excellent success.
I am going to recommend not using any kind of alcohol to clean an atty. Yes, it works, but it also over time will dissolve the adhesives inside the atty. For cleaning, I use Crest Health Pro nonalcohol mouthwash, 10 min soak, followed by lots of hot water. Works very well.
The best way to keep an atty clean is to have a strong battery and a cart that wicks properly without flooding or allowing the atty to go dry (burnt taste). Take care of these things, and cleaning becomes less needed.
Pulling the wick threads out is also not recommended. Sometimes the threads are around the coil, which gets broken when the threads are removed...dead atty, bye bye. If it it worked for you, that's great, but consider yourself lucky. I killed a few doing this in the beginning, thinking "what are these threads...lets pull them out!!". Those threads are a good part of what makes the 510 atty so great.