Not sure that plain gauge are that much heavier TBH and for me they are much better than double butted for lakes/peaks type riding – takes much longer before wheel needs truing.
They're about 25-30% heavier like for like… It is noticable…
And I will say it again, Plain Gauge spokes ARE NOT any stronger! Butted spokes are just as strong, if not stronger (because of the cold working process they go through to make them butted)… If they've lasted longer before needing re-truing for you than a wheel with butted spokes, that is purely coincidence! When was the last time you saw a spoke snap in the middle of its length? They always snap either at the elbow, or by the nipple, where the butted spoke is still 2mm in diameter. Plain Gauge spokes are much cheaper to make, hence they exist, they aren't there because they're stronger (cos they're not!).
Yorkshire Lad, my offer still stands if you want a wheel's worth of butted DT Comps in black including nipples… Tenner posted to you…
Incidentally, don't know how long you've been building wheels for ozzo, but I've been building wheels for almost a decade now! I've probably built 100 or more, all using double butted spokes, and neither myself or anybody else riding wheels I've built has ever had an issue with them…