Hi tamaracks,
Thanks for taking the time to come back after a few months and share such a detailed and informative update … I appreciate it.
It seems that it really did take some trial and error to get there but it’s great to see that you ended up with a configuration (and mattress protector) that is working out so well for you.
I also completely agree with you that online configurators aren’t nearly as reliable as a source of guidance as a more detailed phone conversation which is why I so often stress the importance of a phone call with a knowledgeable and experienced manufacturer or retailer with any online mattress purchase.
It sounds like now you can just enjoy sleeping on your mattress instead of making changes to it 
There is more information about choosing a pillow in the pillow topic here that may be helpful.
Phoenix