The intermediate plate can be upgraded to a much stronger aluminum component. I believe that Bug@5speed can help you with that, along with the front housing.
Your CV angle should be fine. I was riding mine on the bumpstops a few weeks ago, and had no issues at all, except for the fact that I was riding on the bumpstops.
I don't think you can physically achieve an angle that would destroy them by lowering the car, and also lowering the transmission in the chassis as far as possible, but I could be wrong.