Axiom (grainy sonar?)

Just installed Axiom rv9 with rv-100 transducer. Everything works great.. looses bottom everyonce in a while but could prob adjust the transducer to help that. My question is i noticed the fishfinder sonar seems to be pretty grainy. Will adjusting the transducer help or is there some settings i can do that will help.? Ill try and post a pic if i can figure out how!
Thanks

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