10m 500uW WSPR (April 1st)

My 500uW 10m WSPR is on, but no spots by 1410z. 

UPDATE 1707z:   Unexpected spots by EA8BFK (2880km). Conditions were good, but not exceptional. I was honestly expecting today to pass with no spots of my 500uW (0.5mW) 10m WSPR. I must see if there is a correlation between solar conditions and being spotted by DX stations on 10m WSPR with exceptionally low power.  My guess (unfounded) would be that this is possible only when conditions are exceptionally stable, although today rather puzzles me. Sadly, I am not great at Excel! I can use it basically, but can't do clever things with it.

UPDATE 1852z: EA8BFK (2880km) has spotted me again!

UPDATE  1900z: I have created a spreadsheet to see if I can discern any patterns.

UPDATE 1935z:  This is the last week with 500uW (0.5mW) 10m WSPR.   Although this is just a few days, it suggests my best chances are when A and K are low.