Amps that don’t impersonate space heaters.

@helomech interesting. 
My Wilson Sabrinas are 87db and dip into 2ohm. 
I have 2 amps - CSIB and Boulder 866. Different bass but the Coda isn’t lacking. I’m slightly puzzled by your findings but it could be room and speakers. My system is in a pretty small room - 15x13

I started using class D am[lifiers in my space-constrained home office a few years ago.Earlier this year I picked up cherry, 4 yr-old pair of Bel Canto 600M monoblocks. I can't say enough good things about these amps.They have a smooth, refined, powerful sound. They're a real taste of the high end. And of course they put out very little heat.

I do the AGD Audions for the summer and switch to Primaluna mono blocks for the winter. I look at it as a space heater that sounds great! 

Go check out Derek Sanderson’s Fleawatt amps, you’ll be very surprised.  When I A/B’d it against a 6B4G SET amp, I had trouble justifying tubes, it just made no sense in running tubes when I listened to it….

You can go class D or you can just reduce the amount of power.  Think of it this way.  Class A is 25% efficient.  So you pass is delivering 30w x2 so that means 90w x 2 is just burning off as hear.  

You need 1 very good watt to drive those speakers.  Even Class A, 1-5 watts may remain extremely inefficient but if you you were to take say a 5w PX25 amp, it will burn off 15w x 2 instead of 90w.  

Flea watt tube amps are the way to go.  I offer Art Audio which are lovely amps and are magical with Avantgarde, particularly the PX25 but it is a lot more than your current amp.  Any good manufacturer that produces a 45, 2A3 or PX25 will give you what you want I think