What's happening?! Hope every is having a nice kickoff to summer!

I've run into a steering issue, and need some suggestions on the cause as well as a fix if there is one. I've had this happen three times now... the boat seems to get loose and either steers on its own, or doesn't respond properly to steering inputs, and only in flat clam water; in the rough she's solid.

A few weeks ago, trimmed up to maybe 6 on the indicator and running about 60 in calm river water, the boat didn't seem to want to respond to steering, almost like she was drifting through turns instead of sticking. Yesterday, on the same water, she did the same... heading toward a marker and needing to turn to port, she wanted to drift/skid into the turn; not very confidence inspiring. Then while while running hard to make some bridge openings (ICW between Virgina Beach and Chesapeake... two bridges and a lock) the boat decided to vear off to starboard almost like she was bow steering. Again, trimmed up to about 5 or 6 on the indicator. This was scary enough to make me come off the sticks, with people coming out of their seats!

If I keep the trim at 3 (where the drives are level with the hull) this doesn't happen. So what's going on? I've check the steering play and all is good. Again, this doesn't happen if the water has some chop.

Formula 311, TRS drives with Bob's nose cones and 27P Mirage props.

Thanks!

Perhaps I wasn't trimmed up enough for the speed?

Hydraulic steering? If not, the nosecones might be making a leverage point. No nosecones unless hydraulic steering is what I've been told. They leverage in front of the pivot point.

I've heard the same... I was going to take them off, but never got around to it. Interestingly, she only does this when the water is like glass. If the water is churned up, no problems.

And no hydraulic steering yet, but summer bonuses are coming so perhaps that's a sooner than later upgrade.

Im not sure what the issue is but i didnt like the way my 311 drove without external hydraulic steering. Its rock solid with it. These boats should have come with it as a standard option

Check your toe on drives

What should the toe be?

If your spinning your props out. Toe out 1/8 inch.

Just to be clear. 1/8 diff between front of nose one and center of propshafts? With front measurement wider?