A common error in wheel building discussions is to use the terms tension and stress interchangeably. Tension is the absolute load on the spoke, as in 100#s tension is equal to hanging 100#s on the end of a spoke. Stress is a bit different, it's the tension divided by cross-sectional area. It's an important difference because it's stress, not tension that defines the loading on the spokes, and whether they're in their in their optimum elastic range.

Besides offset drilled rims and other ways to equalize tension on both sides of the wheel, the best way to compensate for the unequal tension dished wheels need is to reduce the cross section of left side spokes. That allows you to equalize the stress of the left and right side spokes, while maintaining unequal tension.

Keeping the left side stressed (loaded) eliminates possibility of nipples backing off because a spoke goes slack.