OK, I think it is time to update everyone on the silicone caps. I got them 4 days ago and am using them exclusively on the B-tanks that I have. I have tanks from two different suppliers. I have not seen one leak in four days. I notice that when I filled one so much that there wasn't any air left in the tank at all, it hit kind of dry and burnt. Took out a little and it was back to perfection. I have drained the tanks to almost nothing left and no leaks. Like DaveP I noticed that I could almost completely eliminate the leaking with the original hard caps if I refilled the tank before it go much below half full. Now with these silicone caps they just don't seem to leak. I will follow up, but I would say that I now have the system I was looking for. The ego-T with silicon caps works great. No problems at all.
As I mentioned in an earlier update I also tried the SmokTech transparent, 4ml, low resistance, dual coil cartomizers for the Ego that I got from MadVapes. They are cheap and they work great. A little more taste out of the liquid and a stronger TH. Could it be less vapor than with the standard Ego-T? I think so. Maybe I like the smoother, lighter taste that comes from the Ego tank and atomizer. They are still my favorite, but I will also be using the SmokTech cartos. They are cheap, easy, and hold a lot of liquid. PBasarro (sp?) put out a great video on how to clean the SmokTech cartos.
I finally have what I was looking for. A great, all day, vaping experience in a dependable, (non-leaking), and discrete device. With these fixes the Ego kit is still the best every day vape. Yes I like higher voltage, but I don't want to carry around my Big Kazoo with a tankinator around the office. That is where the Ego comes in.
Thanks again to all for their comments.