Sorry to hear but get use to it, I think they send the small ones out on a dare to tease you and just after you take your shot they big ones come out to tease you

its a sorry fact of life. Next time your in 1.5 just take the shot from the surface you make too much noise trying to decend at that level, and generally the fish scram. Although taking a shot from the top calls for some serious aiming. Went out for a dive at Bakoven and shot some nice hottie felt very refreshed after two hours in the water came home and made a stack of fish cakes. Pity bout not hooking up though would have been lekka.
btw the fish do rip us off is their given right :P