This is a very common beginner misconception. In a stable flight condition you don't adjust speed with your throttle, you adjust speed with your pitch and associated trim. With throttles you adjust the rate of descent. That isn't particular to landing, it goes for in-flight trim too.
Once you have your plane in landing configuration on final you set the speed with pitch trim to the desired approach speed (as directed by AOA indicator for example) and then use throttles to adjust the descent angle so that the plane will come down at the start of the runway. Unless you are throttling up or down a lot, your speed will stay the same.
(If you do throttle up or down by a large amount, your speed will eventually be the same again. It's just that inertia will cause some oscillations around the set speed. You would handle the stick and adjust pitch to prevent oscillations, but not change trim if you want to end up at the same speed.)
I don't know what you're trying to get at here. You have to flare, otherwise it's going to be a hard landing.
Of course, you mustn't pull the nose up until the tail strikes the runway. That's what these limits are about.
Um, if your velocity vector is above the horizon you're gaining altitude which isn't very conducive to landing. I think you mean the nose. Where your TVV is pointed relative to your nose is related only through many variables.