I had those as well (SD5), currently have a Tektro that allegedly has the same adjustability. After all it's just modulation control, won't change the cable pull that much to make a huge difference. It's noticeable better, but it won't actually change the ratio from 2:1 to 1:1.
Worth noting that Avid speed dial levers have adjustable cable pull so you could wind them in for cantis to get enough leverage.