Tubes that provide natural timbre will not have you desiring more warmth. I'm quite sure the Acmes, and the other top tubes will make your present Gold Lions sound washed out and grey in comparison
Stated so well and the truth in my opinion. The upper tier 300bs excel at providing a "natural " purer sonic character. This is very desirable as the unique differences between various recordings become very obvious and stand out. If a recording has warmth you'll clearly hear it. If a recording is drier , cool or thin youll immediately recognize that sonic character.
There's no need for gratuitous warmth as it is not necessary. I use EML XLS and last night I listened to 4 different jazz guitarist recordings. There was plenty of instrumental tone warmth if recorded as such. At the same time plenty of air, articulation and subtle-inner detail made apparent.
From my experience Takasuki and Elrog are similarly capable and I'd imagine ACME and the current model W.E. 300b. I'm not suggesting that they all sound the same (They do not) . But they do share an avoidance of "added" fake warmth coloration. They strive for natural/neutral tonal presentation. The upper level 300bs will provide all the tonal body, harmonic color richness that's present. They just won't make it up.
Charles