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You want to be looking at the 8kg/80nm/450lb range for track.
You can get away with a softer rear spring on a full coilover.
Harder springs on the rear are used on separate spring and damper setups. I'm not sure on the technicalities of it.
Oh and to use the full strenghtening kit, you need to run a full coilover on the rear as the kit removes the rear spring perch of the standard setup.
You can leave that part of the kit out, but then that's pointless IMO.
Do you think you need it stiffer or is more of that you just want it?
If you're going for the beam strengthening kit then just stick with the 19mm RARB.
Or the 22mm bar without the strengthening kit.
22mm bar + the kit will be mega stiff.