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Frank, why did you eliminate a level living space, only to go back to a sloped outdoor space? Sight unseen,I think that you may have created further problems for yourself.
In Florida, where you live, homes are typically built slab-on-grade, with an exterior perimeter "foundation wall", as part of a monolithic pour. Patios are just poured on-grade, without the foundation, since there are, typically, no wall or roof loads imposed on the poured patio "floor". Accordingly, the building of walls and roof would impose loads which the patio was not designed to carry, resulting in concrete cracking and displacement.
The floor structure which you tore out, tapered 2" x 6", with plywood flooring on top, as you described it, created a sort of light weight "honeycomb" which allowed the loads of the previous walls and ceiling/roof to be partially distributed on the patio, not loaded just at the outside perimeter, since the plywood acts as a connecting diaphragm, transferring part of the loads to all tied-together members.
Without consulting a soils engineer, an educated guess as to the approach you contemplate would be that pouring a leveling layer of concrete would, indeed, over-stress the patio, especially at the unsupported edge, since the normal procedure would be to tie in the now-non-existing perimeter foundation to the poured concrete floor with re-bar, sized and spaced according to the engineer's calculations of what is needed to handle the proposed loads.
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