If your floor is solid then all you really need are the jacks.
However, you should have a proper contractor look at your joists... They might be sagging for reasons like rot or termites... In which case, floors jacks aren't going to do anything but delay the inevitable.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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