Adjustable strut rods... adjustment?

I just got some RMS adjustable struts. They look exactly like the PST ones.
The only thing I find thats a pain with installing these is that you have to leave the LCA side of the new strut loose to make adjustments at the heim side. The problem with leaving the LCA loose is that when you adjust the strut length, the LCA side wants to thread or un-thread itself, moving that side of the strut either closer or further away from the LCA. Then, when you do tighten that side up, it changes the overall length of the strut.
But...I totally appreciate the tips here on how to get it right. It makes sense to keep most of the front suspension together and then test for binding through the range.
Its funny because the directions to install these say to just cut out your old struts and adjust the new struts so you have 3/4 of an inch of thread showing and install. Done, simple, easy...lol