I guess my question says it all. I have been using an eGo 900mah and Boge lr 2.0 cartomizers. Even though I am fairly new to this, I have quite a collection of juice, mostly pg/vg mixed. I fill my cartos using the condom method, and then drip juice into the top around the edges until I see that it's nice and full. I never let them get dry, always keep them nice and juicy. I have some sweet juices and some not-so-sweet juices. It seems to me that my sweet juices are gunking up the filler in my cartos faster than the not-so-sweet juices. 
I can see tiny black spots around the top of the filler, and they don't seem to give good flavor after the first couple of drags. My cartos are each dedicated to 1 flavor, and it's hard to keep track of how many refills I have gotten because I top it off regularly. Is it my imagination, or do sweet juices shorten the life of a cartomizer?
**I want my cartos to last a long time. I have been trying to take care of them the way I should. I want to refill them many times before throwing them in the trash. What is the best way to do this?
**Am I doing something wrong?
**If so, would it help to switch to a regular Boge carto for my sweet juices? Or would that even make a difference?
**Perhaps go with more pg?
**Can you remove the filler from the carto before cleaning and replace it with fresh filler? Seems to me it would get a better cleaning... What would I use to fill it, and how much filler to use?

I can see tiny black spots around the top of the filler, and they don't seem to give good flavor after the first couple of drags. My cartos are each dedicated to 1 flavor, and it's hard to keep track of how many refills I have gotten because I top it off regularly. Is it my imagination, or do sweet juices shorten the life of a cartomizer?
**I want my cartos to last a long time. I have been trying to take care of them the way I should. I want to refill them many times before throwing them in the trash. What is the best way to do this?
**Am I doing something wrong?
**If so, would it help to switch to a regular Boge carto for my sweet juices? Or would that even make a difference?
**Perhaps go with more pg?
**Can you remove the filler from the carto before cleaning and replace it with fresh filler? Seems to me it would get a better cleaning... What would I use to fill it, and how much filler to use?