Integrated Question

I am familiar with much of the equipment you are talking about. My first reaction is that most likely it is something other than the integrated. each piece of gear checks the box… that’s good.

It would be helpful if you could post photos of your system. There is a place to create your virtual systems. 

To answer your question directly… the Boulder or Pass amps would be great choices that will give you greater punch and accuracy. I don’t recommend the Luxman… to me they are too trebly and midrange / bass shy. I do not have experience with Accuphase, but I am pretty sure it would be in the running with the Boulder and Pass. 
 

Each of these three integrateds have the advantage of being significant upgrades over what you have today… all be it all solid state… so they are going to be more accurate sounding. 

I’d try experimenting with some interconnects before ditching the amp as they may give you the tweaks you’re looking for without having to throw the baby out with the bath water. I’d very highly recommend you try these Acoustic Zen Silver Ref interconnects as they’ll likely tighten up your bass and may also give you a little more upper octave detail and air without sacrificing musicality. If they don’t work out you can turn around and sell them for little/no loss and certainly much easier and cheaper than swapping amps.
https://www.usaudiomart.com/details/650019426-acoustic-zen-silver-reference-2-free-shipping/

Best of luck.

I am enjoying my newly acquired barely used Soulnote A-2.  I was looking for an integrated for my weekend home, and this came along.  At 100 watts per, I was a bit worried about power.  But it is more than adequate to drive my venerable 802 Nautilus speakers in a fairly large room.  I added an Auralic Altair streamer / dac running on wifi.  I also have two vintage M+K subs.  This system sounds amazing with the new Soulnote, Heads above my old Halo A51 powerhouse amp and Lexicon pre / pro.  This investment is small next to my main home system, yet puts a smile on my face!

Appreciate your responses. Soil - I have tried a few cables through either a purchase or trial from The Cable Company - Analysis Plus / Snake River Audio / AQ / Cardas / JPS / High Fidelity?

Some of the cables above offered more than the Morrow, but when cost was factored in, Morrow was best all around for the money. I have not looked into Acoustic Zen. Just looked at The Cable Company and they carry AZ may rent and give them a try.

ghdprentice - thanks. Pass was my first thought. My choices are based on what may be possible to audition within 100 miles. I am going to ask the dealers, if they would allow me to bring my 225i in and play on the same system as their integrated. Thinking that I could possibly identify the sonic differences that may carry over to my system? Crazy or not possible? Going to give it a try. Thought about Aavik and Gryphon but price is concern. Too many options.

I truly enjoy the tone and essences of my current system. Just want to sure up the bass. 

Fastfreight - Funny you brought up Soul Note. I was talking with TMR and they recommended Soul Note. I thought about waiting to see the new A3. My concern is power. Everyone I spoke to about the Totems suggest abundance of quality power. That’s why I was hesitant to consider Luxman. I am not in any way speaking poorly of Luxman but I associate it with my 225i concerning bass.