Welcome back travis! Hope you find the positive here, as there is a lot of it. I agree with the others in this thread that a quality 2-piece may work for you.
Me, I'm a chemist by profession. It is a rare pleasure when a technology comes along that has the potential to help so many, and is also something that us McGuyver types can get our hands dirty with. I personally find it exciting that this technology is so new and so able to be modified by anyone with some tools and the will to make it better. I absolutely love the McGuyver stuff, and the fact that vaping is all new chemistry!
The 510 did take quite some time to make work well for me, but now I spend very little time tinkering with it, and my ZFM carts give excellent vapage all day every day, non-stop. Your problems with the stock cart filler is spot on with what I found. I like making things work, and with some learning and several failed attempts, my 510 works really well for me now. Certainly didn't in the beginning.
Maybe vacuum cleaners don't make this kind of following, but I am also involved with vintage vacuum tube stereo electronics. You wouldn't believe the things people do to make their stereos sound better and better. Why? Because music is an obsession, and a stereo that can recreate the real performance is a beautiful thing, and making your gear do that is a journey that is fun and very rewarding. In many ways this forum reminds me of the tube audiophile DIY forums I've been involved with. And the best sounding tubes generally came from Germany, not the US. Now its China. Funny that.
With analogs I had very little control over the way I was consuming nicotine, and how they were making me feel sick and awful. I was paying through the nose to maintain a habit, and that was money going to the govt, BT and eventually BP, which I believe wants us to get cancer because cancer is one of the biggest money makers on the planet, besides war. If a huge corporation or the govt told me they had the perfect PV, and vaping will be perfect now and always forever and ever, I would run away! I happen to like it that this is still a cottage industry, with fantastic and caring people selling these devices, and there is much room for tinkering by the consumer to make them even better. That's good!! The more I can do with my hands to make my vaping better, the more control I have, and the less control the powers that be have!
I also believe that due to this crazy forum, the quality and variety of PVs has skyrocketed, even in the four months I've been vaping and a member. And the basement and garage modders and sellers still live and die by the reviews and comments here. Enough complaints, and products improve or sales drop. They must produce a quality product. I don't want to be able to buy a Chuck from a 7-11, because that Chuck will be a piece of crap, like everything else sold at 7-11. Nor do I want to be able to buy nic-juice there...I want to buy from the guy busting his hump to make me happy. And I want to be able to tell everyone here how happy I am, so that guy can feed his family busting his hump to make more people happy. There is so little of that in the commercial world of the US today, and almost none in the world of nicotine consumption...until now.
It used to be, back in the early 80s, not so long ago, that if I wanted my 128 KByte PC to do something special, I had to buy a computer magazine and type in a program, debug it, run it, crash it, debug some more, and finally get it running properly, in less than 100 KB, since DOS was about 30 KB. We were so thrilled that we could actually see what we typed on a screen!! And when we didn't have to save data and programs to cassette tape, and could use floppies, wow, that was heaven.
And how did that PC stuff get started? A couple of losers named Jobs and Wozniac tinkering in their garage and selling some pasted together toy they called the Apple to anyone that would buy it...and there weren't many at first. At first.
Welcome to the cutting edge. Full of frustrations and setbacks and failed technologies, which some of us find to be deliciously challenging and rewarding to solve. And which some just find to be frustrating and failed. There will always be those that sit back and expect perfection and convenience to be handed to them. And there will also always be those that go through the exquisite toil to try to create just that, knowing they never will completely, nor does it matter, because the journey is so worth it.
Your concerns and observations of PVs and the industry in 2010 are completely valid and I agree with all of them. How you choose to deal with those concerns is up to you. But however you chose to deal, don't worry, you will always be in plenty of good company. I prefer the world of imperfection, as it gives me something to do.