When i first got mine i did also suffer with a bit of back ache and it was all down to the seating position as i have no problems now.
I basically set it up like this.
Height so my head was about 3/4 of the way up the windscreen, about 4 notches up from lowest point
Tilt was fairly flat (like an office chair) so it doesnt compress your hips if it's too tilted.
Backrest was upright so i could only fit my fist between my head and the headrest.
And i think most importantly the seat was a couple of notches closer to the wheel than i would normally put it. I think i was stretching to the wheel which caused the back ache and with the ride quality i wasn't getting enough support. So i put the seat further forward , roughly, stretch out your arms and the top of the steering wheel should line up with your wrists at a comfortable stretch.
Dont have the side bolsters too tight either.
Before i found this to work i tried every position for at least a week. Very low to the floor, tilted backwards, quite high up, backrest further back etc...
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