Hi Alex,
Yes, if you're content that the brakes and alignment are okay then maybe concentrate on the suspension and bushings. Cone bushings, end links, sway bar end link bushings, rear radius rod bushings and front swaybar block bushings in that order of concern for your problem.
Interesting you should mention IPD poly bushings. I've got an IPD sway bar and poly bushings on my turbo 940, but not on my NA 940. I'm more worried about the poly bushings going dry and wearing out than the rubber ones going stiff and crumbling. If the poly bushings are young then I'll refresh them with poly grease before they dry out, else I'm switching back to rubber. The sway bars provide the stiffness in roll handling, not the little bushings. I don't think poly cone bushings are available and if they were I would never use them.
As for switching from rubber to poly bushings, I'm no longer a fan, plus they're normally more difficulty to install, in addition to the dried out lubrication issues. Stick with quality rubber, Volvo OEM and Bougicord preferred, but Pro Parts and MTC are adequate and will get you by for a number of years.
There was an interesting disussion about poly bushings here a couple of years ago. John Sargent is a long time Volvo RWD expert and a past major contributor here. Knows way more than I do. He's very familiar with the later 960s, also lives close to IPD in Portland and uses their stuff whenever he wants. Here's a brickboard thread you might find interesting.
https://brickboard.com/RWD/index.htm?id=1689182&show_all=1
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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