M3 subframe bushings will make the car more stable under hard acceleration and deceleration, that is a fact.
I also see another problem with your alignment specs, you had your rear toe at 1/16" per side? That is not enough and will cause some stability issues when accelerating hard and braking as well.
Another area to look at is the oem rear toe links, they come with rather soft bushings and toe setting can change under load and cause stability issues as well.
Let me know if you need to subframe bushing tool.
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