Looks pretty good slabbacks..(that's a pretty good sized fish in the 4th shot to make a return that big)...
I would turn "Sharpness" Off ..unless you are specifically looking for fish...(higher sharpness just makes the image grainy looking...but it does make the "white fish echo" stand out against the bottom better)...
I notice a faint white trail just to the left of the center line boat path..
This is usually caused by something blocking part of the left SI beam...motor, drain screen, another xducer, etc...
Keep the pix coming...you're doing a great job...
Rickie