what are your selection settings? like the magic wand? Mine is set on +0 Transparency Strict but in some of your speedpaints it looks like you just click it once and bam, perfect selection xD
oh wow xDD my lineart brush is usually at about 12 but then again i do press very lightly yeah, just make sure the lineart is all closed up otherwise the magic wand tool doesn't select it cleanly ; u ;