Your mounting appears solid. The trick is always to get the camera as close to the suction mount as possible. Some phones have better image stabilizing than others. Make sure it's turned on
Often it's better to use a small action camera mounted directly to the windshield. You can match up the video with the data in post. I've used the SJCam M20 super cheap 4K cameras with great success!
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?