WRT the struts/springs, there is nothing I am aware of that's off the shelf. That said there are options- there are plenty of companies making lowering parts for the RSX and Civic which have strut front suspensions:
This is for a complete coilover setup (replacement strut and threaded body & spring) but there are companies such as
http://www.ground-control.com that make just the threaded bodies and springs. You could get their threaded body, put it on the stock strut or an aftermarket strut, and stiffen the ride. Damping would suffer without getting a stiffer strut, though, inducing some bounce (maybe making the problem worse).
AFAIK there is nothing significantly stiffer than stock out there, though Koni does make "inserts" you can modify any stock strut to use.
For the rears, I see Monroe and KYB options but again, nothing significantly stiffer or adjustable. I would bet that given it uses a standard-looking shock that you could find something along the lines of a Pro Comp or Rancho that would bolt up.
No matter what, you would probably end up doing your own "development" work on this.
As mentioned, the MDX or Ridgeline parts may cross but probably won't help much.