Is it the DAC portion of the Deckard that is holding it back?
Off of your combo would it be better to get the Deckard and at a Bitfrost MB down the road? I imagine the Deckard like you said is as strong of an amp as the Lyr 2?
First caveat, this is my subjective impression as someone who's heard a decent amount of headphones, amps, and DACs. But it's just my personal opinion.
The Deckard's DAC is very good for a $700 Class A amp/DAC combo. I believe it's a Brown-Burr DAC. But it's still a Delta Sigma 1-bit chip. I heard immediately noticeable gains in detail and presence of instruments when switching from the Deckard DAC to the Bifrost Multibit. Once you switch to multibit you'll notice just how "harsh" and "digital" DS DACs sound in comparison. Like upscaling a 480p image to 1080p vs a true 1080p image. Sure, the picture is there but it's been filled in digitally with approximations of the actual original source data -- in this case, music. The Bifrost Multibit keeps all the samples for 16-bit CD quality music (or streaming) and in my opinion it shows.
Some people unbendingly think DACs are a minor part of the sound and might advise against my opinions. All I can say is I am a firm believer in multibit technology, specifically Schiits and their digital filter. While it seems expensive spending $600 on the Bifrost Multibit and $700 on the Deckard, it gave me an amp/DAC system that would cost 4-5x more from other companies and probably not even sound as good.
Deckard is interesting because it really isn't being hyped up/discussed as much as other amps in that price range. I have limited experience with amps, but multiple review sites have said the Deckard pairs well with top of the line, difficult to power headphones like the HD800. I am currently using the HE1000, which isn't as power hungry yet is still one of the best headphones (if not the best) available and I think it has more than enough power to run it well.
It is a beautifully designed/looking amp that had thought put into it to make it quality, not just a headphone manufacturer throwing out whatever it could scrape together to earn a buck.
The only downside I currently have is that it's missing is balanced output. But you'll hear opinions on both sides as to how much that matters. I'm sure the Lyr 2 sounds great, but I'm very, very happy with the Deckard.