I usually do not send CQ, but this is just to check if my QRP signals are heard by other stations.
It seems no stations can decode my CQ when the output power is only 2 watts, the minimum power out of my IC-7410. These spots pop up only when the RF power into my diopole is either 5 or 10 watts.
Later I had a QSO on the 40m band with a domestic station 240 miles or 390 km away with the output of 2 watts. The report was 599/599, but it does not give you much information.