It's a hassle but check The nut on top of the front strut assembly. Either cut out metal to access from top or take assembly out as you did with the lift install. After you reassemble the strut and spring the nut sometimes need to be further tightened after settling or the vehicle weight compresses everything back down.
Ok, just by way of an update and to close this thread off.......
After the Bilsteins I ordered fiiiiiiiiiiinally arrived (20 days, despite having been offered and paying extra for 5 day shipping),
I booked the car in to a specialist 4x4 shop over here called AAA. The owner came for a quick drive with me after 10 seconds said, " Hmmm, they've tightened up the control arms with no weight on the wheels."
So, they changed out the ruined bushes, pressed in the new ones and installed the 4600 struts with new top mounts and isolators.
The noise has gone!! I love my Jeep again.
So, word of advice, if you install new LCAs, make sure you lower the jack so that some of the weight is on the wheels before torquing up those bolts.
Wanted to do an update on this one. It is another lesson for me about my Jeep and about trusting mechanics.
I was all excited when I posted my update about tightening bushes with weight on the wheels. That still holds true, but a day after I posted it, the clunk was back.
Long story short - took it to a guy I know and it turns out that the captive nuts in the transmission crossmember had been spun off their securing welds with an air gun by the goon who changed out the transmission filters. Since they never got brought to the correct torque they gradually loosened up and everyone's efforts to tighten them up later on were pointless.
My guy removed the cross member, cut it open, rewelded the nuts, sealed the crossmember back up and Hey Presto! Silent running!
So, I have wasted several hundred dollars on steering racks, bushings and hours of labour on tracking down a noise that the transmission guy could have prevented by owning up to his mistake and spending a couple more hours putting it right.
At least I now have new bushings all round, lovely responsive steering and a tight, "like new" ride.