Last year I bought a Garmin Echomap UHD 93SV which came with the GT54 transducer. I have been sorely disappointed in the sidescan. I've watched numerous YouTube tutorials for setup, including the guy in Texas (who's channel name escapes me at the moment I went through a process of leveling the transducer to the water level with the boat in the water, etc, etc, etc. I've tried numerous contrast/brightness/color settings, as well as frequency changes.

Frankly, I can't see much more than tremendously grainy images which are only occasionally identifiable, such as a log with limbs, much less actually see fish to the side or under docks. I've seen absolutely nothing like the crisp images I see guys showing on their YouTube videos. Mine are just horribly grainy, and though I can see the "shadows" usually, I can only rarely make out what is throwing the shadow.

I've heard the GT56 is better and produces better images than the GT54. Is it THAT much better? I mean, if it would produce what I see, those nice crisp images or is it only a slight improvement? But I don't see just throwing a lot more money into it for a slight improvement.
Appreciate any input!