Just for information, the reason those wireless chargers don't work is because the Pixel phone uses a charging standard other than Qualcomm's Quick Charge. You need a wireless charger that uses the USB Power Delivery system that Google and Apple phones use.

 

Here's an article that tells the story and supports codesplice:
https://www.androidcentral.com/best-google-pixel-6-wireless-chargers

 

Well it might be better to not equate the two, and just focus on getting the best wired charger and the best wireless charger as two separate things. The Pixel 6 Pro website states wired charging can go up to 30 watts while wireless only up to 23 watts, so even though wireless charging tech is evolving, at this point it's still a matter where using a USB cable will provide more power transfer than wireless charger. Or in other words, you might already have an optimal wireless charger that provides enough power that your Pixel can take in, just don't compare it directly with your USB cable charging.
https://www.androidcentral.com/wire...hat-does-actually-mean-efficiency-perspective

https://store.google.com/product/pixel_6_pro_specs?hl=en-US

 

I don't use wireless chargers but I do use power banks or portable chargers. I had the same problems you did when I purchased a power bank for my Pixel 6 Pro. It said it was for our phone but when I tried it, no fast charging. So I searched Amazon for Pixel 6 Pro chargers and then checked the reviews. I searched the reviews for the Pixel 6 Pro then looked through them for saying it fast charged. I found one and bought it. I got it a few minutes ago and it works, Fast Charge and all. Just a thought.

 

Your 'problems' appear to be based on misconceptions on how batteries and chargers function. There are dozens of variables involved that are only interrelated to each other under certain conditions. It's not a matter where a charger will pump out it's maximum rated power into a battery when you connect to it but rather the voltage and the amperage will vary in accordance to things like temperature and what the battery's current charge rate is as that moment. The amperage will vary basically throughout the entire charging session. For some really good articles that detail the process, go here and read through some of the postings in the 'Charging Methods' section:
https://batteryuniversity.com/articles

 

I'd just keep what you currently have. You can keep buying more higher capacity chargers that can provide more power but the fact is your phone's battery will only take in its set, maximum.
https://store.google.com/product/pixel_6_specs?hl=en-US

For faster charging, buy a new phone that's built to accept higher rates.