Again, I don't know anything and am completely taking out my a$$. There are other in this community that may know better.
No, you're correct. The biggest issue you're going to run into is the radius arms binding. You can continue to throw longer shocks at it which will help but geometry is always going to be an issue. You can 3-link it which makes a huge difference. I plan on going a different route next year which is going to be a play on the radius arm and a combination of johnny joints to decrease the bind. Having a dedicated trail rig vs a DD is going to make a big difference too. All depends on where you want to go with it.
As far as the rear goes, same sort of thing. You can get more down travel by putting longer shocks on but you'll run into geometry issues as well and you're going to start dropping springs once you get close to that 30" mark (at least with OME springs)