If using propane the engine will pretty much work no matter how badly things are constructed as long as the propane is injected radially within the flametube through at least 6 equally spaced holes with NO AXIAL INJECTION , and there isn't a regulator fitted for the fuel .
What is actually wrong with your engines performance, more info please ??
You'll need a different system with kero , a hollow cone pattern spray nozzle is prefered , kero is a very different fuel to propane , its much more difficult to get "right" , and unless you want to spend a lot of development time on it , probably better to go with a conventional setup, we need fine atomisation and good fuel/air mixing .
I'll be looking forward to seeing her fired up on kero :-)