There is a bike sitting in the corner at my closest lbs due to be decommisioned. It has a longer reach stem on it. I'm not sure if another 2cm of reach will help much, but its a tempting idea to pick up that stem and see if it helps. It won't go any higher, but it will make it a little longer and perhaps a tad more comfortable. I already have bar ends on - they don't show up well on the photo, and the bars have been narrowed already. It feels great up front.
I tried to replicate the cockpit I have on my other two bikes...
Both of which are very comfortable. But, I think its a case of the frame/fork and the tires themselves. They are simply different. I'm not sure how much wider a tire I could mount on the bike... I have 175 slicks on the mtb and these seem much narrower. I think they are either 25 or 28c.