I will chime in...even though I have tried to skip the subject because there is alot of "experts" on facebook and all that have their opinions and people that know me, knows that i'm not a big fan of arguing over a keyboard.. Some would say I lack diplomacy ..but i'll give it a shot
Lifting a an ifs front with either stiffer springs or spacers does exactly the same thing to the half-shaft...which is to accentuate the angle.. I have said it many times, the quality of the half-shaft is essential and I am glad that someone actually made some tests and measurements... Thank you !...
I have run my first trail pathy hard as I had 2 arb lockers installed on it and I ran at first the ac coils, then my spacers (2.5") and I never had binding in them. mind you they were OEM Nissan... One thing I did was to change the neoprene boots with thermoplastics ones made by rockford...I actually made a post about that explaining how I made them add this boot to their catalog...that's another story..
The only time I broke something with a cv was doing a full send climb, locked all 4 on a steep hill and my right tire got stuck in a rut while having the skinny pedal floored... that ended up in the halfshaft snapping in two.... not the cv joint....the shaft... you can barely hear it at the end :https://photos.smugmug.com/Trail-gazoduc-4-jours-juillet-2010/i-FrTDTBn/0/bf7a4533/640/broken-cv-640.mp4
That being said, I also did limiting straps on my struts in order to prevent too low of a drop..therefore saving the over extension...
I have over 1000 kits sold and of course my kits are for the beginner off-roader that don't want to break the bank in order to start...but I have demonstrated that with some modifications (limiting straps, thermoplastic boots and good oem quality half-shaft), you can go a long way.
That's all i'm gonna say as I just wanted to share my opinion and experience... I'm sure others will have something to say about this and I will respect that.
Bringing a product to market is not an easy thing...there is always some that will say why it is crap and why it will not work or it cost too much etc... All I have to said to you is bravo and keep at it if you believe in it. I'm sure you'll end up with a great kit to sell and i'll be the first one to refer you guys when your kit is ready for primetime.