Im running 35 psi with tubes, seems ok right now.
Not managed to get out a ride with the stem on, just out on the road for a quick ride round the block. I feel more comfortabe on the bike with the 60mm stem, not sure how it will feel on te trail with regards to the steering.
I know what you mean about the shifters/levers. The shifters seem a bit far away, not sure i am that bothered by it. Will be interested to see how you get on with the blanking plates.
I am going to order on of the on-one stems, seem good value and nice and light to replace the temp one i am running right now.
Overall i am very very happy with the bike, it really does ride well. The only major thing i would want to change is perhaps an extra 1 deg less on the steering angle. I might feel a bit happier on steep decents. I just need to get used to it and alter my body position more.