I think this gets down to the "bundling" question. If they fan out between bored holes this is a pretty thin beef. If the installer was very neat and they run in military precision I see the *potential* problem with the ones in the middle.
Rake them out with your fingers. Then they are not bundled. Twisted and kinked is a plus in this case.
It seems strange at first but "neat = heat".
The same thing is true in a panel when you see those "aircraft like" wire harnesses running down the gutters, tywrapped, with breaks at each device. It looks beautiful but derating can rear it's ugly head.
