Tripping breakers,neutrals,120 volts and 240 volts OH My!!!
RMS versus peak to peak is realy outside the scope of a do it yourself forum. If the vertical double headed arrow labeled 120 volts inside the sine wave subtly did not go all the way up to the sine wave peak while it continued to touch the baseline (still labeled 120 volts and no other explanations) then we are "technically correct" without having to explain ourselves in a nearby footnote. And we could fiendishly prefix all discussions regarding RMS with "OT:" (off topic)
Stop wasting time re-adjusting the pattern. Have several lawn sprinklers, one for each pattern.