The best method I know of for bringing a wheel up to tension is described here.
On a somewhat related topic, I have had the same problem ever since I rebuilt my KH20FL wheel: every few weeks or months, while riding, I will hear a sharp “ping!” and know that another spoke has just snapped at the elbow. I weigh 90kg and do drops of up to 30cm, though rides down gentle stairways are far more frequent for me, but in any case I have been told that none of these antics should be leading to broken spokes, and indeed, before I rebuilt my wheel, they never did.
I usually true my wheel with the tire, rim strip and cranks removed, just to be as unencumbered as possible, and so I can check for both true and roundness, and because it is the wheel that needs truing, not the tire, but still, no matter how true I get it, a spoke pops every so often. It’s been almost two years now. I have also noticed that I always have a few spokes that are so loose that I can finger-tighten them, though I never do because I have an almost superstitious fear of causing some sort of tension imbalance…
Should I throw out all my spokes and start over? Keep replacing them one by one? De-tension my wheel, then true it and re-tension?