The banks six gun is both powerful and requries a very precise install procedure. I have tested the box at 92 peak-to-peak horsepower gain at the rear wheels. It works as advertized. The secret is to follow the instructions EXACTLY, especially the learning sequences, looking at the blinking lights and interpreting what they mean, etc.
But once you go through things correctly, you will have no doubt that it works. the dern thing runs like a house on fire, and on level 6 you WILL notice the touchy throttle!
make sure the speed loader correctly sees an EGT probe. it won't even fuel unless its there. your description sounds like the speed loader is not engaged, which means either or both of the following: (1) it doesn't see hot enough EGT, or (2) the learning sequence hasn't completed correctly.
If you look at TDR issue #47, check out the EGT bar graph. it shows the Banks six gun runs about 150 degrees cooler than traditional pressure boxes at the same power level.
As I read through the Banks comments in many many previous threads, I notice that they seem to polarize their customer base more than others. either people heartily support them or people start dissing them for a variety of mostly opinions.
I'm pretty box agnostic, and have personally tested 10 boxes on the same truck; seen all but one on the dyno, etc. I find the Banks box, like many others, lives up to its claims. the only thing I can fault it for is the complexity of the install, and for that you get their drive train slip detection. the sophistication in this box is pretty impressive -- they are reading stuff off the CAN bus and making fueling decsions base on that info. You can't even swap the box onto another truck without going through the learning sequence again, because it knows the differerence. Once installed, though, its all smiles.