Some of what you’re asking about with overspeed or resisted training (alone, not in conjunction) can be found here from the Tudor Bompa thread:
http://www.charliefrancis.com/community/showpost.php?p=218039&postcount=127
And there are some similar results from the Athletics Canada page about Soviet research. I’m not saying they don’t work at all, but they don’t seem to work nearly as well as the uphill/downhill contrast method.
What I’ve seen written about the contrast method is that the uphill/downhill portions are in the 20-40m range with 30m for flys being used by just about everybody, but the runnig in the flat tends to be longer, from 60m or 60m flys to 100m for me.