You could try wider rims too, like the current flavour of the month, the Velocity A23.
Also, a carbon post will be a lot comfier than an alu one, especially a stiff one (oo-er) like a Thomson.
Apart from that, I really don't think a carbon stem will be worth it - many of the ones you can buy are super-stiff sprinter's stems that won't do much for comfort. Carbon bars definitely ought to make a difference though. 3T Team ARX stem (forged alu with titanium bolts) and 3T Team bars (carbon) would be comfortable, strong and ~320g for the combo in average sizes, so a pretty big weight saving over what you're using. Maybe not the stiffest bars in the world, but more stiffness might equal more harshness in this case.
You could try wider rims too, like the current flavour of the month, the Velocity A23.
Also, a carbon post will be a lot comfier than an alu one, especially a stiff one (oo-er) like a Thomson.
Apart from that, I really don't think a carbon stem will be worth it - many of the ones you can buy are super-stiff sprinter's stems that won't do much for comfort. Carbon bars definitely ought to make a difference though. 3T Team ARX stem (forged alu with titanium bolts) and 3T Team bars (carbon) would be comfortable, strong and ~320g for the combo in average sizes, so a pretty big weight saving over what you're using. Maybe not the stiffest bars in the world, but more stiffness might equal more harshness in this case.