Run the recommend weight. 5w30 is perfect for 99.9 of all situations.
In particular, full synthetic, 5w30 with its smaller base chain means it does a much better job of cold weather protection and lubrication.
Don't get sucked into internet crazy about people who recommend odd weights. There was a time, 15 years and back when engine tech and oil tech where less advanced and you would run different oils in different seasons.
30 in winter, 40 or so in the summer. These days, the engine and oil tech has made this obsolete, but habits die hard. Like the 3k oil change, which is utterly ridiculous and a waste on any properly functioning car made in the last 15 years.....but, people still do it.
Sorry for the tangent.