Perhaps what has lead to differences of technique here is a confusion between a Go-around - a much underused manoeuvre I would suggest - and a Touch and Go. This is because the Touch and Go is an artificial concept. It isn't a manoeuvre that has a place in day to day flying.
As Tinstaafl says the object of an approach is to land and stop safely. Touch and Go is used to cram landings and take offs into training situations for reasons of economy. As pointed out above, learning research might suggest that teaching unnecessary and confusing manoeuvres might be at best counterproductive and at worst downright dangerous.
I would recommend teaching Stop and Go and the baulked landing (or Go around) and abandon the touch and go altogether.
I would also agree with retrimming for each take-off.
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[email protected] edited for tautologies and dyslexia
[This message has been edited by Code Blue (edited 14 May 2001).]