Posts: 3488
Location: Elk River, Minnesota | Hiya,
There are a few things that come to mind here with the set-up that I think should be explained a bit further in detail, which may help clear up some misunderstanding.
First and foremost as mentioned by Steve Worrall, this is really going to be a rigging and prop issue. Here's why:
When a boat has a tendency to pull to one side or a list while at speed (leans to one side), that is due to a huge amount of torque from too high of RPMs, the prop biting the water and potentially a torque tab that is in need of adjustment as well. My guess is that when you are up on plane, the motor turns easier to one side than the other. This can be adjusted out by a couple of changes. First, check the torque tab to see if it is not way out of adjustment. If the motor turns harder one way, turn the tail end of the torque tab the same direction (harder to turn left, adjust the tail end of the torque tab to the left). This will help some, but it will not solve it all....I think this might be more due to your prop than anything as an incorrect prop can cause all kinds of issues which compound on each other.
Another wat to reduce torque is to raise the motor up out of the water a couple of holes. As backward as it sounds, moving the motor up will increase the amount the prop will slip in the water, which will also reduce torque since there is more air introduced to the prop. This will also help take care of excessive bow rise on hole shot as well, given the motor is trimmed in fully (which if tilt stop is in the lowest or next to lowest position on the transom bracket).
Moving the motor up also has another advantage for you as well...it will reduce the amount of porpoise in the boat unless there is a bigger prop issue, which I have a feeling you have here. I'm guessing you get a big porpoise when you try to trim up (in other words, the boat will not trim well and the bow stays down), which seems to describe the "digging" you mentioned. the prop does not match the set up..
Trim is the interesting part of the equation as the motor's ability to keep the bow up is dependent on RPMs, prop design and prop diameter. The lower RPMs, the tougher it is to keep the bow up, thus, when slowing down, one must trim down as well to keep the boat comfortable to run. If the prop is too high of pitch, porpoising will happen because the motor cannot reach full rpms...or...it can also happen because the prop DIAMETER is too small, the motor over-revs which means it is not grabbing the water well enough (which is what I think might be happening to you) when you trim up, thus the bow falls and the process repeats.
As Steve mentioned, your issues are most likely related to a prop, so If you are willing to divulge some information there, we might be able to get you onto something that will work much better. For starters, what props have you tried, and what what are your speeds with those props? Brand/model , pitch and diameter are important here as well as your rpms. If anything we can get you on a starting point to solve the issues. by the time it is all said and done, your boat will float along while cruising, knock you back when you throttle hard, and corner well, without any undo stress on you, or your boat.
Steve
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