I´ve been trough the same not too long ago. Just a few points:
1) Every instructor (willing to do good) will tell you the "secret perfect landing technique". Truth is it works for them, not necessarely for you. Sometimes they can be almost opposite.
2) Don´t stress too much over it. Everyone has been there at some point. Try to do your best. Be open and brief about your shortcomings to the instructor. Tell him what has been happening, what you are planning to do etc. This will show maturity and situational awareness on your part and maybe most important increase the safety of the operation.
3) Now for my secret perfect landing technique....
a) GS/2 is the ROD you must maintain (there´s no fixed value for this) until 50feet. As you know at 50feet the elevator memorizes the position etc etc. (check it in the FCOM) so if you come to this point at the correct speed, with the correct ROD and correct attitude half the work is already done.
b)Don´t fight the last 50 feet of the landing until touchdown, instead fight all the way down until 50ft (aiming to cross as described in point a) and at that point just accept what you´ve got and stop chasing any indication, just focus on the flare.
c) Coming down don´t chase the FD. My control over the aircarft on finals improved A LOT once I stopped paying so much attenction to the FD which actually was just "sucking my mind" and making me become fixated on just one thing. Instead open your scan, look mainly at your ROD (GS/2) and the pitch required to get said ROD. Look at the glide and loc indicators and react to them, not to the FD. Look outside. Use the FD only to "confirm" you are on the right track.
d) Once at 50ft STOP CHASING AND ACCEPT WHAT YOU´VE GOT. Give the ROD a final look and with this info think how much flare input you´ll have to do ONCE YOU REACH 30FT, NOT BEFORE. If crossing with 500fpm you know it will be a small flare, crossing with 700 it will require more input.
d) The rest is... well, supposed to be easy, what can I say
As mentioned before: start flare at 30, smoothly cut the power, look mid to far end, if you feel like floating just let go a bit (do not press down) etc etc.
Happy landings!