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You might use a plinth under each component, and several placed in the center of the room.

Then set up screw jacks spaced around under the center of the floor, under anything with a plinth and also under anything really heavy.

The jacks would in effect ground the twist-o-flex floor to something solid (the floor of the basement). 

Avoid jacking the floor into a preloaded convex parabola in an attempt to get it "tight".

It will over time requre more and more lift, as the floor structure will adapt and conform to the load, resulting in a sort of relaxed parabola. This is where a few plinths in the center would be of use; get the floor loaded, theoretically sagging a bit, then cram a few jacks up from underneath and bring things back into line.

The other way to do it is to tie the suspended floor to the floor of the basement; not just pushing up from below, but tying it down with rigid members fixed at both ends, locating the floor in space so that it cannot move up or down.

jd*

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