Just posting here to say that I have succeeded in getting both the Venus and Sun Sigils earlier yesterday and today. The Venus Sigil was much easier than I expected, thanks to the automatic crater trick, and the Sun Sigil took me about 1.5 hours or so to finally get it after much trial and error. Using the D-pad helped a lot as was tapping it to either the left or right quickly to avoid the birds. Also, I did not go out of the way to get some balloons but rather just sped through the race while getting the easier balloons in the way.

Switching off the music and muting the TV helped a lot too. Silence can work wonders when it comes to your concentration. ^o^