Best time for an HF contact using WSPR Data

I'm hoping to have a contact with old friend VK3ZZC and to figure out the best time to suggest a sked I look to the WSPR data between my station and Ross VK1UN/1 (who's actually located in Melbourne at the moment).

I grabbed the historical data of Ross receiving me from the WSPR spot database and plotted it in local time.



Although Ross spots me all through the 24 hours, the best times are 5am and 7 to 8pm.

It would be nice if it was a little easier to grab the data for this kind of plot, but it's a very useful resource.