More warmth for the Aeolus? Already a very warm headphone,but OK.
La Figaro 339 is a warm OTL,and very good. There are a couple different builds of this amp,so do your homework prior to buying.
I use a Glenn OTL,which cannot be beaten for under $5K. A basic model will run you around $700.00,but there is a wait period to get one completed.
Understand that which tubes you choose to use will impact the sound greatly. Running an RCA tube vs. a GEC tube,for example, will sound entirely different.