Shorting S&P ETF's during UK Trading Times

I have been short on the S&P for a few days using the inverse ETF and wanted to clarify some thinking around maximising profits during trading hours UK vs US time.

See screenshot below…outlining when the UK market is open and what is happening to the S&P during UK open/closed hours.

You can see, box 1 is relatively flat with the drop coming after UK closed. So missed it. It opens a bit down the next day. Box 2 sees a nice drop although it continued to fall.

Box 3 again largely flat but the drop came after UK closed.

So is it a) is it really worth shorting US markets during UK trading hours?

Anyone done good with shorting markets using ETF’s?

Feedback welcome.