Foz2,
This may sound a bit silly, but is the seat in the same place for each flight?
When its in its lowest position, the view you get over the nose will be completely different to when its fully raised.
If your instructor is saying something like 'raise the nose to the horizon', and the seat is fully down, then you will be flaring more than if the seat is fully raised.
It doesn't matter where you have the seat, so long as you are comfortable and it is consistent from flight to flight.
Apart from that - nail the speed and look at the end of the runway.