Hi,
I have not read all the replies, tldr. But maybe I can help.
I work in a shop that sells cdales, and I have an EVO with a wheelsmfg adpater running a gxp crank.
Firstly, make sure you have the right adapter, there is pf30 and bb30. EVO uses pf30, which is the press in plastic/alu cup. bb30 bearings press direct in the the frame's alloy shell with circlips to hold them in place.
Next, the stock wheelsmfg adapter requires the use of flat spacers to take up the slack, but these are no good, they don't hold bearing preload good enough.
They can be too tight, like your case in the first post.
Or too loose, causing creaks.
This is why most pressfit systems rely on a wavy washer to provide correct bearing preload.
So what I did on my bike is to use all the adapter without any slim washers, and take up the slack with a 24mm wavy washer on the drive side. This has worked well for me. I place it on the drive side to get the Q factor even.
You can buy this 24mm washer from a SRAM dealer, as this is the washer used for pressfit gxp.
Hope this helps.