changing direction under throttle!!
ok, no i wasn't refering to doing EPIC SKIDZ BRO but when I get on and off the throttle the car twitches L/R.
also gets funky when cornering hard under brakes
thinking it's either worn panhard rod bushes or worn rear arm bushes.
HMMMM to poly tuff or to natural rubber....
Hoon!
Bob I think your car is suffering from a bad case of "hectik skidz bro"
I suggest increasing the numbers of doors to 5 as they seem to not suffer from the same issues the 3 doors are experiencing... 
But in all seriousness other than the occasional squeak here and there I will recommend the poly tuff bushes. Not just saying that as the R&D vehicle but the on road comfort and smooth feeling far out weighs the limited flex loss off road which is never a problem with the locker in anyway. They may or may not be stiff in a 3dr but in my 5dr whether I'm towing / heavy roof load / 5 passengers it's always smooth where as the stock rubbers had noticeable movement under pressure / high stress situations.
Not to open another can of worms but with the 50mm spacers, longer shocks, commo panhard rod and king springs in the rear I don't think the poly bushes are the limiting factor to the flex in the rear of mine. But as yours receives a similair balance of 80% onroad hooning and 20% off road thrashing I can't complain.
Syndicate
I would want to look at the front end...
It's been quite a while since I had to diagnose an issue like that, but the front "radius rod" bushes is where I would start - the diagonal links that run from the control arms to the frame.
OE style rubber bushes - Febest should have them, I have not seen any suppliers for polyurethane, although I should admit I stopped looking after I found a source for rubber - I don't know that I would recommed poly on a 4WD, by all means, fit them on a street/track car if you wish - they limit flex, desirable for handling, undesirable for traction - pick the one you prefer.