You lost me at the rear strut bar actually making a difference. Many well respected people on here have verified that there is no advantage to have a rear strut bar.
You also don't mention what kind of driving you do, what your experience levels is, etc. Sounds like you made about a thousand changes between your chassis, suspension and driveline within very short periods of time, so I very much doubt you know how it feels from part change to part change.
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