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I can't wait to mix your line with Mr. Ferguson's! Of the six I have, two are showing blue in the tail and one is showing black. Unfortunately, the one with black in the tail is the darkest, a really nice deep buff. Sigh.
Do you know what happens when you mix red in with the buffs? Would it help darken the color or just create something more in the partridge line?
Buff is diluted red, so breeding red will likely deepen the colour.
However, reds usually have significantly more black present in wings and tail than buffs, and you would be increasing the odds of adding that black. Getting partridge penciling will only occur if the red already carries the genes, and that should be apparent.