My f70 makes allot of noise in my area. I have found that about 30 sens and +9 thresh I seem to get my best depth. Would I be better to go with more sense and less thresh. Any tips or advice would be great. I have set the f70 on the shelf because the explorer seems to be less noisy. Since I received a Fx-1 for the f70 I would love to start using it again. I have the stock coil and the f75 stock coil what would be the better coil to use. I have used both but been using the F75 coil the last couple of months