The "blue" from gold is much different from the iron toners. It can get over the top if not careful. Which gold formula are you using?. that will make a diffeence as well. Blue/gold will give a much more intense blue than a straight commerical (FOtotospeed gold ). Intense is a strong word as it is not as intense as iron, but has a blue cast.
I have much interested in testing some Spreebrew chemistry but don't know where to get it here in the states.