There’s a number of things at play when it comes to blade excursion. Things like the moment of inertia of the blade, the strength of the spring, the force applied by the spring over the motion of the cam (square or rounded), location of the kick in the closed position relative to the spring pin and the force applied to start the blade into motion.
I understand what you think about the half stop- the right angle on the cam gives it a little more oomph, but depending on all of the above you might find that the half stop kills the momentum of the blade midway through travel. That might help prevent blade rap.
Engineering-wise, it’s a simple mechanism and this could easily be solved using CAD programs, or careful hand calculations using conservative estimates. From a practical stand point it would pňrobably be easier just to assume 2x blade relief in the wells.
There’s other possible fixes: really light and small blades or very strong springs, but without consideration of the other pieces of the puzzle those fixes might not guarantee success.
Side question: how do you cut yourself due to the half stop? Im not saying that I think it’s a huge safety feature, but I’m surprised it makes the knife more dangerous for you.