I don't have a PureDirect mode on my 2105 so I can't help you there.

My stereo and direct modes appear to be the same as yours.

So now let me stir the pot some more :

1. I was just listening to the Eagles Farewell Tour (awesome!) in DTS + PLIIxM (for my rears). When I set my mains to large and enabled LFE+mains, I got more bass punch. Why??? I already established that this shouldn't happen because I have my sub turned up 6dB higher than my mains. And this does not happen in other modes (direct, stereo, PLIIx...I haven't tried DD yet or DTS/96).

2. Has anyone tried setting all of their speakers to large to see how bass is affected?