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I doubt any company is going to make "overload" springs but there may be some air struts made but mostly designed for lowering it and bouncing up and down at shows, etc. There may be some good effect from using lowering springs only in the front, would level it out somewhat and may balance the ride a bit but not likely to be as effective as you need. The only real solution that may be made is full coilovers and there are a number of companies working on them. My Matrix, XR, same struts as yours, is being used to prototype some high end ones, the springs can be swaped out, the ride height adjusted, etc.
Normally you would want to do both ends of the car, the cost will be a bit high at around $1,900 retail for a full set. Then there is install, not all that time consuming but testing a few different spring rates may cost a bit to get it dialed in. Knowing the weight on the rear axle would make it more likely to get and exact fit the first try though.
Of course there may be other ways to accompish this, some cheap inserts into the coils etc. but I highly recommend to not go that route unless some company has a quality product that is safe to use, I have seen a few broken springs from the generic cheap ones.
Once the units are on my car, being manf in Europe at this time, I can let you know the results and what can be done for you. My emailis below, get in touch in a month or so if still not found an answer. This is not an advertisement here, only trying to help.
raam@raamaudio.com
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