OK first off this is all my opinion and as such can be disagreed with if you wish.
Hull design is always a compromise.
Deadrise, or v angle, shallow v makes for a faster hull but harder landing, deeper v makes for slower but softer.
Rails are there to deflect water and energy away from the hull, mostly down if you can.
There is a high(er) pressure area developed at the hull water contact point, anything above that is in the air and as such useless ( unless you are looking at aerodynamics)
Most of the stuff below that is drag and therefore a hindrance. Trouble is the bloody water never stays in the same place, so this area moves around on the hull so you have to balance that to try and make the boat do what you want it to. SIMPLES.
We do have a scale hullform for this boat and if you want you can see some of the video on youtube search kitten268 and see the dart vids.
You canít get data for a planning hull from a model, basically you are trying to balance the weight of your boat on a small patch of water that is wobbling about, even in a test tank with loads of money to spend the variables are too great. What you can get is a very good feel for how the hull is going to handle and any nasty/nice characteristics it is going to have.