Never heard of motofab before - but I see they offer a 100% satisfaction guarantee - presumably you're not satisfied, have you contacted them?
I keep breaking the outer joint mostly on the passenger side only if I drop off in a good rut where it's fully flexed
What makes you think longer axles will fix it? Will that change the drive shaft angle when it's fully flexed? What do you mean by "fully flexed" - full extension or full compression? Have you considered the effects of a longer axle when the suspension compresses?
There are several companies that offer lifts, and are quite familiar with the Suzukis - low range off road for example.
I don't know which Jeep(s) you had, but they can be quite a few differences in how things are done - a GV has independent front suspension (as do some Jeeps), drive shaft angle becomes an issue when lifted, and the most common way to deal with it is to drop the front diff - it's usually not required on a two inch lift, but, is a motofab lift a two inch lift, or is it more?