I have a 91 I/O with the 350 and volvo penta dual prop system and it wanders at low speed. I have trim tabs and they don't help. Trim tabs are nice but they wont help with that problem.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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