i have a buddy that runs a GT with 15" WOT..i ran into him today on the beach,he can only run his sensitivity @ 3 O'Clock.which is almost off .he does quite well with it..i have a GT with a Sun Ray S12 and i can run my sensitivity @ 9 O'Clock ,which is almost all the way up.this is on the same beach.iv owned both coils and like the S12 better...but i don't understand the big diff in settings???? any ideas?