I used a Joye 510 and an Ego for over a year... the vapor was always hit or miss. The main issue is the juice delivery and there are so many variables... depends how thick your fluid is, how clean your wick/foam is, how clean the coils are... Thinner juices flow better... Also, cartos are meant to be disposable. Sometimes they just stop doing their job!
This is why dripping, tanks, bottom feeding, etc are so popular... cartos have minds of their own!
OP... you could try de-wicking a 510 atty (if you have one) and dripping directly on it... dripping is the best way I've found to get consistent vapor, flavor, and throat hit. If you like vaping, it may be time to upgrade... a 510 will only satisfy for so long!
If you need help with de-wicking, do a search here on ECF... its been covered over and over again! If you need help and cant find what you're looking for, PM me