As Nikki mentioned this is not an uncommon problem at all. Remember that most mattresses are made for the average person (20-25 BMI) and at 6’ and 230lbs your BMI is around 31 (very close to mine) which definitely needs special consideration in order to get something that works well for you long-term. If you are curvy, have broad shoulders, big legs/rear, etc then that adds additional demands on what you’re expecting the mattress to do in terms of performance. In general the buckling column gel on top of pocket coil design of the Purple 3 isn’t bad but it definitely does have some limitations on who it will work for.
Here’s a good thread that will likely help you in your quest to solve your issue:
https://forum.mattressunderground.com/t/search-for-a-new-mattress-leaving-purple-need-suggestions