Got schooled on mixing ratios by a 70 year old mason in Pittsburgh

Last Thursday this retired guy walked past my site, watched me slap mortar down, and told me my mix was too rich for the old soft brick we were laying, and after he showed me his 1:1:6 lime blend it stopped cracking almost overnight, is there a rule of thumb for matching mortar strength to brick age that I should've learned years ago?

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