The OP obviously still wants to nail down some sort of satisfactory answer to his/ her question Unification Of Forces In The Very Earliest Universe and so do I.
The answer to the previous question in the link above, although an excellent summary of the method by which forces differentiated, did not address the point of "what did the unified force era "look" like?
Fortunately for me as a total amateur, the properties of a unified force concept during the minutely short timespan that it existed, is not described by physics as we currently understand it. This allows me freedom to waffle away, but I will try and keep it as coherent as possible.
We have no evidence of what went on during a very short time within which nothing, apart from possibly a temperature drop, occurred. No matter existed and we have no idea of what effects a unified force may have had on the radiation present at this time.
So all we can do is guess, and I have never read of anybody even trying to guess, perhaps for the same reason as we keep saying just after rather than at the Big Bang and also because because of the short time involved. Without forces or matter, it sounds pretty uninteresting, especially if you can only guess with no chance of testing anything.
It's physics (Jim), but not as we know it, so what's the point of thinking about a plenum, full of radiation, but with completely unknown (and unknowable) properties?
Optimistically, there are two advantages to any understanding that the idea of a unified force may provide. They are both the worst examples of handwavy, "then a miracle occurred", type speculation, but if you got this far, I'm near the end of the answer.
The first advantage is that, in some way a unified force may help resolve the problem of Low Entropy at the just after the Big Bang. A unified force would have been "smoother", more homogenous and more isotropic that anything that has existed since and this smoothness may have, despite conjectures regarding inflation, symmetry breaking, vacuum fluctuations, mini black holes (and whatever else went on), carried on to maintain a low entropy state. Don't ask me how, it's just a wild guess.
The second advantage of a unified force is that, through gravitational wave detection techniques from inside the surface of last scattering in particular, we may discover more about phase transitions, symmetry breaking (Higgs Field, say) and how to solve the Hierarchy Problem.
If I could extend my solution set to include the cosmological constant discrepency, I would, but I fully admit it's all ridiculous extrapolation as it stands.
I don't think this piece is worth voting on, or even commenting on, because of the lack of evidence from nature and the lack of knowledge from me. If you can view it as "not even wrong", I'd appreciate it.