when I used the carts that came with my ego I noticed that they were melting just a little bit on the end that you insert into the atty. To remedy this I ordered a few stainless steel drip tips that I love and look sweet on my rig and have been dripping since. However I do see a benefit to having a few carts lying around. my question is, was i doing something wrong? Over vaping? Were they cheep carts? And can you recommend me some that you like.