Ok, guys. I decided I do not have to stick stubbornly to the 510, so I am buying an EGO. I decided it would make sense since the two systems are compatible to a certain extent.
I already bought an Ego 4.2v battery, and used it with the 510 atomizers. Gosh, it makes a difference. The Ego basic kit is on the mail.
So far I had been using the atomizer/cartridge system. Since I found out that you do NOT have to use the filler material, I actually got a lot more excited about it. However, I think it is imperative to have cartomizers also, to use when I am not home. I think I ruined the first batch of 510 cartos by not filling them correctly (learning curve!

). I put the other ones aside and will wait for the syringe with a blunt tip to arrive in the mail.
Thanks Cookster I will look into the pen/PV thing. It is always good to have something in hand for stealth vaping.
I really have to try different stuff before I travel, particularly when it comes to juices, since I can't afford to buy a huge quantity of something that won't work out for me. I am having some shortness of breath for the last few days, probably because of the accumulated mucus due to quitting smoking, but I have to make sure it is not caused by the vaping at all. I ordered some 100% PG and 100% VG stuff so that I can exclude one or another being bad for me.
Loving the recommendations. Can you guys tell me how much the Ego cartomizers, atomizers, clearomizers and batteries last with you? I have no time to figure out!! Let's make a rough estimate of my daily vaping at 5ml.