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I think all those ideas are reasonable. The trouble is quantifying how much "comfort" you'd get from each idea.

I think simply swapping to 17s with a meatier sidewall will make a decent improvement, but the bigger difference would be softer dampers... Unfortunately, softer dampers might not appropriately damp stiffer springs - resulting in a bouncy ride.

Another thought are your anti-roll bars. If they are aftermarket, you could realize a nice improvement by swapping back to stock. Keep in mind ARBs have zero effect when both wheels on the axle are simultaneously being jounced - but have a big impact when only one wheel is being jounced!
 
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