OK as we have a few weeks of testing on the new arms. Here is the info I can give you.
rubber-ed up black carpet, Purple stripe tires, glued fronts, Stock motor, alloy chassis.
The best balance and speed with full smooth hard rotation through the corners with the new arms.
5 deg reactive block, 2 caster shims rear. ( aprox 2.5 deg caster), .8 camber. Has not only yielded the easiest drive but the fastest times. This will feel a little different then the old new-school front end but the finish of the corner is faster and the over all drive is easier with the added corner speed.
Also remember these are just 3d printed. While it is awesome that we all get to try them out and get involved on the r&d of the cars progression they are not production strength. So be advised smack the wall hard you should expect to replace some parts. With that said they do take more then I thought they would for abuse.