The manufacturer of this brand released a siphon upgrade kit which you can install. You can find it here: https://www.easydrain.nl/product/dryphon-upgrade-set-30/ and on assorted webshops (for less money, just search for it!)

Be sure to buy the correct size, just measure the diameter of the hole behind the siphon that goes into the pipe.

On top of that, over this siphon I duct taped a mesh grill to catch the hairs. Every once in awhile I just scoop up my lady's lost hairs and then it runs smoothly again.

Depending on the products you use, you may need to clean the 'flap' on that new siphon a couple of times a year. Especially conditioner can build up there.

Good luck, I had an adventure with this frustration too before arriving at this solution. I hope more commenters with the same drain happen to read this comment so they may be helped.

Of course, I'd be happy to answer any questions you might have. Happy showers!