thank you everyone for your support in working this out for me.
Now from reading all this i am still confused

, i know its about technique most of the time but i think you need to have the right gear to balance it out.
I have posted up my swimming style can some have a look and tell me what you think if its me or the fins.
Nata here is your answers
a) Where are you from?and where do you usually dive ? Sydney Australia , i dive from a boat most of the time, i go to the queensland also the depths of the reefs are anywhere from 10m to 35m there. there are a lot of deep caves that i wont to get too and till have bottom time, i wear an open cell wetsuit 3mm and have about 12-pounds i think of lead
b) How tall are you and what do you weigh? 6,3 191-cm 92-kg
c) Are you an experienced diver? been spearing for 2 years dive around the 15m if i have a good breath up i can do around 20m
d) For which type of dive do you use them ( apnea, spearfishing, snorkeling ecc) ? spearfishing