I've been building my own wheels for as long as I can remember now. I've got some fine example well over ten years old, all on Mavic rims.
I recently bought Roger's e-book and I did pick up a few bits. I discovered that even though my wheels have been true and stayed that way, they were not very evenly tensioned.
So, I treated myself to some Flow rims and a Park spoke tensometer. So, I build these up true and even and stress relieved. However, few weeks later, a few loose spokes. Fair enough, have another go. I end up with a wheel that is lateral by 0.2mm, round by 0.7mm and dished so that I can't actually measure the error! Spoke tension is plus or minus 5% of the average of 110 kgf as confirmed by Stans. When i first rode the wheel, there was no pinging. So, how come a couple of months later I find one very loose spoke and that the spoke tension is all over the chip shop.
What am I doing wrong? Should I go back to mavic? Would be a shame, I love the Flow rim when it's running true.