The best thing you can do for articulation is just not making things too tight, don't overtighten shackle bolts and grease everything real good. I can attest to this, a week ago I took my front end apart, greased the bushings spread the ConFerr shackles a bit, and put everything back together with lock nuts and not too tight. Went out on Sat., one obstacle that I usually end up getting 2 feet or so of air with the left front tire I was now able to keep all 4 on the ground. And best thing is all it cost was an afternoon of time.
I paid about 4 bucks each for them from RE plus shipping ofcourse(ouch). The problem I have is breaking the zerks off, I've removed them for now tell I can weld some short pieces of pipe to the shackle plate to protect them.
You can also loosen the spring clamps depending on the clamps. This worked very well on my old springs.
IMO, don't waste your time on folding shackles,(I used to think they great) I've had them, made them, ran them and its much better to have a suspension that has down force and won't unload at inopportune times. Same goes for buggy springs but their not as bad.(I ran both for over two years)
BUT If you must try these shackles, my web site has a writeup to make your own and save some bucks.