you may be an experienced model pilot, but you should pay attention to what is being said in this thread.
I am an instructor in our club and have flown many LT40's.
Yes the plane does like to float. And with a bit of head wind, it just doesn't like to land...... (good trainer)
One thing I have noticed with this airplane, is that Sig's suggested elevator throws are a bit small. This is because it is meant for the novice.
If your idle is set right as you say, then you are just not slowing the plane down as much as you should...... maybe add a bit more throw to the elevator to get that nose up...... and like the one of the other posts....check the balance.