Recent upgrade to Cronus Magnum

A few weeks ago, my system consisted of the following components ...
Apple TV >> Naim Unitiqute (v1) >> Harbeth P3esr

While I liked the overall sound, I wanted to move up the chain and try something different. I felt the Unitiqute was a little underpowered. So when an Audio Rogue Cronus Magnum came up for sale (local craigslist), I jumped at the chance and bought it. I had a Cambridge Audio Azure 851D stored in my close, which I added to the chain. So now my system looks like this...
Node 2i >> CA Azure 851D >> Cronus Mangum >> Harbeth P3ers

When I first made the change, I was quite impressed with the increased loudness and a wider soundstage. However, I realized that, unlike the Naim, I was getting listener fatigue. There was a certain harshness (like metallic sound) to the vocals, especially female vocalists. Also, I was expecting some tube magic, which frankly is just not there. The Cronus Mangum sounds much closer to a solid state. Yesterday I put the Naim back in the system and much to my surprise the little box is keeping pace with the much more powerful Cronus Magnum. Yes, it doesn't play as loud and the soundstage is not as wide, but the sound is so much more refined, smooth and balanced. I'm wondering if I made a mistake. So before I make further changes, maybe the good folks at Audiogon can provide some relief.

What do you think is the weak link in my system? Should I keep the Cronus Magnum and try a more musical, refined DAC? If yes, what do you guys suggest (prefer used, below $2000)? Or do I ditch the Cronus and go for a more tube-like sound (Primaluna, Rogers, vintage ARC, etc)? The little voice inside me is telling me to sell the Cronus and move up the Naim integrated chain (e.g. Supernait), since I really liked the Unitiqute's refinement and balance. But then again, what if it's not the amp (Cronus) but the DAC (CA Azure 851D) that's the likely culprit here? Should I change the DAC first? Or maybe try rolling different (smoother?) tubes?

As you can see, I'm mighty confused and can use some pointers. So many variables ... aargh!!!!
another thing to check is the speaker leads inside the cover.  they can be set to either 4 or 8 ohms. my harbeths sounded horrible with the 4 ohm leads connected to the speaker terminals.  make sure they are wired for 8 ohms.  
First put good quality NOS tubes unit 
that is a big upgrade in itself
and a good power cord.
Pull the cambridge from the chain and go straight from the node to the cronus. I have the cro mag ii and the node 2 and i would have no problem doing that. Check your underhood leads as mentioned before. Sharp nasty sound can occur and i have found that if your gain is too low going into the cro mag you may have your volume on the amp turned too high. It sounds like a scratchy overdrive that affects the mid highs. Fiddle with it it may smarten up . Change your center 12au7 on the cro mag may be done and producing noise. 
Just my two pennies worth, your description of the Cronus is exactly what I heard from a Primaluna integrated a little while ago, so I’d think twice about including that as a possible replacement.

IMO- your to-do list in the proper order:

1) Check (4 or 8 Ohm) Impedance setting
2) Perhaps what davekayc suggests.
3) Tube rolling
* I disagree with the Power Cord suggestion, unless you happen to have another one to try. Not that it won’t change the sound, but I wouldn’t dump any money on one.