I think you're a bit confused. Let me take a step back and go over construction of a bottom feeder.
There is an atomizer connection (usually 510 style) surrounded by a "catch cup" on the top, and powered from some sort of battery on the bottom. Through the center of the connection, there's a tube that goes to a bottle of juice. You screw in a heating element of your choice -- atomizer, cartomizer, or rebuildable into the connection, and vape it like you would on an Ego. Except you can keep adding juice to the said heating element through the bottom by squeezing the bottle. Excess juice comes out into the catch cup and will be sucked into the cartomizer/atomizer when there's room for it there. For that to work, the heating element has to have a hole in the bottom. Most standard atomizers and cartomizers do, most rebuildables don't.
So, as you can guess, the amount of vapor, throat hit and flavor will be governed by the atomizer or cartomizer you put on your mod. I haven't vaped kanger T3's, so I can't comment on what's going on with yours. Bottom feeders give you two advantages over running the same atomizer/cartomizer on an Ego: you can keep adding juice before it runs dry, avoiding burnt wick and disgusting taste that you mention, and they hold a lot more juice.
Now, to go over the issues that you mentioned. If you don't get enough vapor or throat hit to consider it a satisfying vape, there's a chance you need more power there. That can be accomplished either by lowering resistance of your atomizer (I'm not sure if Kanger's come in different resistances, but generally clearos are pretty high), or raising the voltage of your battery. The first can be tested pretty cheaply by just getting some lower resistance cartomizers or clearomizers. Anything with 1.7-2.0 ohm resistance should give you the punch you want at 3.7 volt. Alternatively, you can replace your Ego with an Ego twist or Spinner, that would let you try higher voltage for much less money than a mod.
My overall suggestion to you (and I don't mean to sound patronizing), is to try some of the cheaper venues before getting into relatively expensive mods, until you find a solution to your issues. Bottom feeders generally have a bit of a learning curve, and, when used improperly, can produce very frustrating results, possibly turning you away from vaping. I'd hate for you to spend upwards of a hundred dollars on something that would possibly not solve your issues
Please don't hesitate to ask more questions!
Commie