I have the impression that two topics are mixed up here. My post is not about the twisting of the spring in the longitudinal direction, e.g. when accelerating hard. There can help a special spring like you use Montegue, and / or the anti tramp bars. My point is that when the springs are brought to a greater distance from the axle by lowering blocks, the spring becomes more susceptible to twisting sideways to the vehicle, no matter how good the quality of the spring.
However, I must also say that the lowering blocks in your photo are not as dramatically high as the ones in my 4/4 were. Mine were exactly as high as the ones in Lorne's photo in his web article. So of course I had a higher negative impact before removing them.
