Thanks.
I didn't do anything to the tower. With the last tower I dremeled some of the bottom off, to clear the driveshaft, this time I dremeled the driveshaft. I then adjusted the spacers, so that if they move back, the nut will hit the chassis. I also used the link brackets off the old tower as a spacer, hopefully the additional surface area will add some strength there.
The front end seems to be pretty stable , it's kinda hard to know what's happening at WOT, but generally the front end is skyward. :) Lifting the truck up, and blipping on the throttle expands the tires like crazy, but has no visible effect on the front. For all intensive purposes, it seems to be just as strong as the rear.
But, real bashing has not been done. A few jumps off smaller ramps, lot's of wheelies and grass, is great, but until I get some good air, and this thing walks away unscathed, I can't call it a success.