Decent handling susp setup?

Based on that toy? Ok. Unless you've actually weighed all of your components and got that thing set up to the point where it matches corner weights you've actually measured you're just guessing.
Based on math and science. Used all the time on aircraft. They don't weigh the plane every flight, but they need to know the weight and CG every time they takeoff. Do you want to know the benefits before you do the work? I can walk you through it if you want.