Im finally giving up on cartomizers entirely... between burning them (just got a twist and playing with higher voltages) or wasting them on juices that I didnt like... Then it was always a crapshoot if the carto will even work after cleaning it... dont dry it out enough after cleaning and they taste nasty... dry it out too much and they dont absorb right and burn... and of course you dont know it until you fill it up with juice and try it!!!
I cant even begin to imagine how much juice Ive wasted on trying to bring a carto back to life... Your best bet with cartos is to just keep topping it off until it stops performing as it should then throw it out! It may seem like a waste, but its more cost effective (at least imho) to ditch the carto rather than waste juice...
I had some cheap clearos that came with a really cheap 510 kit I had bought, they vape great and clean pretty easy (depending on what flavors Im changing between) but they seem to get a plasticy taste to them that just really ruins it for me...
So now I have some CE3's on order and they will hopefully be the right combination for me and even though I havent even tried them out myself yet, Im going to recommend you try them out as well...
You may even want to try out some other clearomizers or tanks, but when your first starting out, the last thing you want to do is spend a ton of money trying new things and the CE3's look like they clean easy for trying new flavors (no wasting cartos on flavors you didnt like) and can be used with different drip tips (I think the plasticy taste I was getting was mostly from the mouthpiece), plus you get the benefit of being able to see how much juice is left, and when it does die, you can simply pour out your liquid and use it in a new one...
The only real downside is that they can be a little bit of a pain to fill and will leak if not done properly... but with a little patience should not be a problem...
Different vendors have different variations with different names, but since youve already been dealing with SI, that makes it pretty easy since they carry them

Oh and heres a link to Outlaw Vapers youtube video on the ce3's that will give you a much better lesson on them than I ever could...
Smokeless Image CE3 Cartomizer - YouTube
Good luck and hope this helps!