First Watt SIT 5 matched with Devore O Babys

Just perceiving more bass can make a system sound warmer without needing to change any component.

The bass in a room depends upon placement of BOTH the speakers and the ears of the listener. If you have a little leeway as to exactly where your ears are: Mark your current listening position. Move the seat. Is the bass better or worse? Does it sound warmer or leaner? Repeat as necessary.

The same can be done for the speakers.

When I heard the O Baby’s they never sounded like good bass to me. I am 72 with ok hearing, I am not sure music through hearing aids will be good with any system. Have you tried high end headphones ?

I would just call John and see what he recommends. I can't imagine you going wrong with the Pass. Another good match would be Sugden.  

There’s a really nice pair of Pass XA60.5s on US Audio Mart.

Just saying… 

Do you have a tubed preamp? If not, then you may want to start there for more warmth.