When the vapor and/or taste starts to diminish, you can add more
juice to your cartridge. If you say you have LR atomizers that came with your eGo kit, you might want to consider using cartomizers or dripping with a drip tip. I say that because LR (Low Resistance) atties heat up faster than regular ones, so the cartridge or filling might melt or singe, and therefore may cause a gross burning taste.
It appears you have the Mega (diameter as wide as the battery) atty sizes for your eGo, so if you do decide you want to drip, there are vendors who offer a drip-tip for the Mega atty, also known as the "type B" or "cylinder" atty. It's really all subjective to your tastes, but find a happy medium between adding too little or too much juice. Too little may not be enough liquid for your atty to handle and it may prematurely pop, or die. Too much won't destroy it, but it will flood and make a gurgling sound if there's too much, or it may leak.
Make little adjustments and you should have a happy
vaping experience.
Welcome to ECF btw.