Sounds good to me. I've ran the FLM diff cups with the Feigao 9L and never had a problem with them. Just make sure you use thread lock on the screws.
You may also want to pick up some aluminum diff cases. The stockers seem to flex under extreme load.
As for shocks, I've had powerstrokes and they work great! But they are alittle bulky and pretty pricey.
UE Supershocks are great and my favorite. And you may be able to get away with only 4 shocks pretty easily! Plus there threaded so its pretty easy to adjust.
3rd option our traxxas big bore shocks. Great shocks but not threaded.
For the money I'd say UE shocks, Big bores, then powerstrokes.
Of course this is all just my opinion. But I'm pretty familiar with the maxx.
If you wanted you could ditch the wheelie bar and go with a wing. Makes the truck looks cooler and works better IMO. Duhengineering.com makes some sweet Ti towers that except a wing mount. FLM also makes shock towers to do this as well. Both offer lifetime warranty.
TeknoRc also makes a mount thats works with the stock shock tower. Located
http://www.teknorc.com/product_info....4afc3c258de513 and its only $26!!