A complete noob and taught a little from JB book! Please be generous.

I'm building a powertap wheel with CX ray+Kinlin.

In the processs, on tensioning all the spokes equally, used PT TM, I expected the wheel to be laterally and vertically trued but not dished. To my surprise, I find it neither. The spokes were tensioned adequately and stress relieved. I'm worried that either my rim is out of shape or spokes are not good. Am I missing something here?

I could not judge, if washers are required b/w spokes and hub flange. For this kind of build, are washers (on rim [Kinlin] and on flange) recommended or needed?

TIA.