Fern....That axle nut is still my suspision about your failure last time at Shannonville. Buy 2 new ones and torgue them down good and hard. I also have a suspicion that my RR koni has been gone for some time but I can't find my recipt and I know I am SOL anyways since I have my perches cut off.
As for the coilovers, contact true choice in the US. They are a Koni repair center and do custom coilover setups. You may luck out and catch a break if you send them all 4 and get them re-valved and fitted with thier coil over setup for a decent price since you are already getting one repaired.