it is said tht amongst a couple,when one of the partner performs more vibrational exercises

In my not-so-humble opinion, I don't think that's a strictly accurate interpretation of what that @Stingray guy wrote about clattering :)

For me, I've noticed the phenomenon of "clattering" occur only when two people are out of touch with who they really are when they are together.

For example, when someone who is habitually depressed meets another who is habitually depressed, and then they embark on a relationship together expecting the relationship to make them happy...that's what could be referred to as "A Bad Move" :)

This is a prime clattering scenario because as soon as one of them starts to feel better, the initial vibrational levels that brought together are no longer in balance. The vibrational status quo upon which their relationship hinges has changed. It doesn't guarantee they are going to split up but the risks seem high to me.

Contrast this with two people who are initially happy and joyful before they meet. And from that inspired, joyful place embark on a relationship.

Here there is almost no risk of clattering because the relationship was an inspired choice and inspired decisions automatically take possible futures into account.

That doesn't mean that the inspired couple will not have difficulties but those difficulties are likely to be ones brought about by the experiences that some part of themselves want to gain from being together, rather than both of them just wanting to find relief from emotional pain in being together.

So the answer to your question about avoiding clattering in couples is to make yourself into a happy fulfilled person first and then find a relationship...not the other way around :)