Hmm not really, you need a streamer right? A RPI streamer to your Denon will work as well as anything you've tried.Here is my ignorance showing.
Are you saying I could get rid of the node and simply run the Topping D90se into the Denon and use the Denon as the streamer? If thats the case, the nose is getting returned.
This is what I would do.streamer to the Denon via toslink first and setting the Denon to "pure direct" mode first