best product for black cars?

No question this is the product that you want to use regularly. I’ve used it for the past 20 years and it will do exactly what you’re asking. All my vehicles are black and all look like a piano:

https://www.amazon.com/Aerolon-Wet-Applied-Coating-5-Minute-Application/dp/B015OW1Q56/ref=sr_1_2?crid=HZ2HZBY7I1L4&keywords=aerolon+tech+shine&qid=1680036949&sprefix=Aerolon,aps,320&sr=8-2

PS: zero commercial interest

 

The spider webbing is more likely due to washing / a poor washing process rather than drying towel inflicted. Now if you had said you use a chamois or blade to dry the car then i would have agreed.
Give the above product a try you have nothing to loose my friend.
Perhaps you could post some before and after pics?

 

Carbon for black. Been using it for 20 years. Apply with bare hands. Or you could go Solaris...

https://zymol.com/collections/waxes-glazes

 

Don’t let the fact that it’s applied after washing and while the car remains wet fool you. It’s a “game changer” but should be used regularly and used on a car that has a good coat of wax or ceramic coating. It will not resurrect bad paint. It’s meant to maintain a good shine + prevent swirls or spider webs.

 

Im afraid products that hide minor paint imperfections only last for a few weeks as they are simply removed during the washing process, so you have to start all over again.
You are going to have to get the paint machine polished to remove the spider webbing and achieve the gloss level you want.
If you do get the paint machine polished i would highly recommend that it is ceramic coated afterwards, i have been applying Gyeon Quartz Syncro to all of my customers cars, it goes on and off with supreme ease, and if looked after should last around 2 years.
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New 911 Turbo S coated with Gyeon Quartz Syncro.