It is recommended to replace suspension related components such as shocks/struts every 50k, and your post indicates you are at that threshold in mileage. Beyond that, a complete inspection of other related components should be performed and replaced as needed.
That said, the stock suspension was never that great to begin with. Several have experienced component failures on the rear's specifically.
Moving along, there is plenty of weight transfer from the front, to rear axle with the stock setup. Most pronounced when launching it WOT from stop, or slow mph conditions as you describe.
The H&R's will offer you improvement over stock. The Megan Coil Overs are an improvement over the H&R's.
Eibach's are no longer available for our platform due to lackluster sales. They would've fit right in with the H&R's as far as improvement over stock.
Others have tried traction bars and bags, and did not find any improvement in reducing weight transfer and/or any improvement in traction.
Finally, you have to remember, although our platform is marketed as being AWD, it is still FWD biased. Approximately 70% of the power equation is pushed through the front axle, and the remaining approximate 30% is dumped to the rear axle.
So you're fighting an uphill battle as it stands.
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