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My autocross setup was the TRD springs on Koni sports. I don't know for sure the spring rates of the TRD springs but they are probably close to yours and it was a similar drop (0.75-1 inch).
Obviously had different goals than the track but I settled on 1.25 turns from full soft on the front and 0.5 turns from full soft on the rear. 1.5 turns on the front was too much and created a lot of turn in push especially in slaloms. For the rear I felt 0.5 turns was already pushing it in terms of too much damping, any more and I would start adding inside wheel spin at corner exit. Throw on my daily drive set of tires and 0.5 would be too much and leave me peeling out every time I made a sharp right turn at an intersection.
My one gripe with the Koni sports is you can't adjust compression and their shock philosophy tends to give you shocks with lower compression than a lot of their competitors. For not a ton of money Pro Parts can revalve you with DA to help with some of this.
For street settings I would soften front rebound by a half turn and soften rear rebound by a quarter turn (that is, 0.25 turns from full soft in the rear). I do not recommend running Konis at full soft or full hard in case you hit a really bad bump, the adjuster could get locked there and require service. If you're having oversteer issues on the street and your rears are at the "middle" setting try backing them way down.
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