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Before spending lots of money on new suspension/new car, I'd have a look at your tyre pressures you're running. You mentioned you are running 36psi front, 38 psi rear on ATs. Personally I'd say that's way too high. I'd start by going off your tyre placard. For mine (GU3), it's 29psi front and 32psi rear. Give that a go. Of course you may need to run a few psi higher in the rear towing. Having said this, ATs have stronger/stiffer side walls, and can accept a slightly lower pressure. To test, inflate to you target pressure when cold, go for a drive to heat up your tyres, and recheck. they should read around 4psi above your target pressure.
Ive always gone by 4 psi and its worked fine.
So where are we up to, tyres pressures,driving style, suspsnsion seat, might do it, might
04 ST 3lt auto, not enough Mods to keep me happy, but getting there