Upgrade Quandary: Ref 75SE vs Ref 150 (non SE)


I have a ARC Ref 75 (non SE). I’m trying to decide whether to upgrade it to the 75SE through ARC or sell it here and buy an ARC 150 (non SE). For the sake of this debate, let’s assume costs are equal (I know they are not).
Here’s what I’m after
1) More control in the bass
2) More control in upper midrange (same as bass note above)
3) Not deviate too far from the other elements of sound I have.

Room: 21deep x14wide x10high
Dedicated audio

Gear:
Wilson Audio Sasha (1)
Lumin T1 source
ARC Ref 3 pre
ARC Ref 75
Transparent Ultra g5 balanced ICs and speaker cables.
Bass traps in 2 front corners, 1st, 2nd reflection diffusers.

Thanks MUCH!
P.S. No I can’t audition either amp. in my system.
P.S.S. I’ve auditioned a couple solid state amps, they don’t do it for me. Much more bass (too much) and complete control was found, but they gave up too much in too many areas, like air around the instruments and voices and bloom that I love about tube power.


jo1mtb
On the other hand :-)- it deserves noting that Warren Gehl of ARC uses the Ref 150se in his reference system that he uses for ARC's final check-subjective auditioning-of every piece that leaves the factory. Mikey Fremer's two episode video of his recent visit/tour of the ARC facility (available on Youtube) reveals this fact. Warren compares the sound of other amps to the Ref150se as his-pun-reference-before they go out the door.
Checking back in on this.  
I listened to the Ref 150 for quite a while. Just sold it on here. It is a VERY nice amp, but to me the sweetness of the 75 it can't match.  
It beats the 75 in soundstage depth, grip, venue/ambiance, and pace. But to my ears the 75 beats it nearly everywhere else; timbre, sweetness, finer grain, acoustic bellows tube sound, emotional connection to the artist(s) - and I never feel like I'm missing the extra watts.  
Also, I just purchased a 75SE.  Should be here tomorrow.  My 75 will be going up for sale here.  
Thanks all.