In response to your TCS question, in my C172 it depends where I'm landing and what conditions are like.
My aircraft is based at Insch and Aberdeen which are 2 very different places and require 2 very different types of approach.
At Insch which is a 550m grass strip with many obstructions on both the approach and the go around, I tend to come over the threshold with 30 flap at 55 knots. As long as this is nailed you can get in with a good bit to spare even with the downslope on runway 13.
I tend not to use 40 flap at Insch as the go-around from 13 has a set of power cables not too far from the end of the runway and C172's don't climb at all with 40 flap. Not only that but theres often some nasty rotors lurking in that area that tend to suck you downwards towards the cables.
At Aberdeen things are a lot more relaxed, I tend to keep the speed up along finals since it usually a busy place and then bring it back to 60 knots over the threshold with either 30 or 40 flap depending on what kind of mood I'm in.
As for crosswinds I must admit I don't actually reduce my flap setting at all.
At Insch, if I tried to get in with 20 flap at 60+ knots I'd end up planted on top of a stone dyke at the end of the runway wrapped up in barbed wire !!
At Aberdeen I use a slightly higher threshold speed when its windy along with 40 flap so that I'm not floating down the runway, its pretty much a case of flare, kick, thump, and your down with no time to float.
Or if it all goes horribly wrong, Flare, bounce, kick, bounce, flare, kick, kick, bounce, bounce......
Interesting finding out how its done in the heavy stuff though.
Regards
UA