Shock question (PS 440s).

Bolting on never used, rebuilt by Progressive Suspension (PS) 440s on my interstate (IS), reminds me how nice new tight suspension is. I hope to parlay the old leaked out (one) pair with new receipt (if I can find it) into something from PS for my supervalk (SV) IS.

In the meantime, my (slightly) lighter SV has ageing standard duty spring 440s with flaking chrome that have not yet failed (all 440s fail sooner or later, thus the lifetime warranty). The preload on them was turned down 4 (of 10 possible) turns when new, and have never been touched since.

The question: The current 4 setting is just OK, but after years of use, I would like to turn them down another 3 turns (total of 7 of 10 possible turns of spring compression). If I do this, will it increase the chances of them blowing seals and starting leaking down (which will happen sooner or later anyway, but I'd rather it was later)? Am I safer just leaving them alone, for now?

On the one hand, a tighter spring would seem to mean less travel, and would seem to shift work and load away from the internal hydraulics and onto the springs (to some degree). On the other hand, squeezing things often causes them to explode (and this also violates the don't-fix-if-not-broken principle).

Thanks in advance.