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I seem to remember however, that when I backed the trailer in,it had to be way back,because if it wasn't,the front part of the keel at the bow,rubbed on the rear x member.I had to get that low in the water,so the bow would float over it.
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John, sinking the trailer too deep may be part of the problem, since those aft rollers are so deep that they may not have much chance to help aligning the hull until it's pretty far up on the trailer. Even if you have the rollers adjusted like I suggested, that might not work if trailer is too deep in the water. They need to contact the hull as early as possible while you're winching boat on trailer so they can guide it properly.
The first thing I did when I got my trailer was to add a keel roller to center of aft X-member to prevent keel from hitting it before the small rollers contacted hull. That way I don't have to dunk the trailer. If you'll notice in 1st picture of my previous post, I only have to back the trailer in till the tires are wet, which is one big advantage of roller trailers (mine is over 25 years old and still going strong!) This puts the center roller about 6" above the water, just below the bow eye. If you get a roller with a groove in center of it, it will keep the boat centered until the other rollers start making contact with the flatter sections of the hull. At that point they will lift it up off that center roller, which only helps for the first few feet. Once it's off the center roller, the outer rollers should be "locked in" on outer step, which will continue to keep boat centered on trailer. Here's a low angle transom shot showing how the rollers are located on my 20 relative to hull steps.
The hull is very stiff at those steps so that's a good spot for the rollers to support it. Spreading the rollers that far out may lower the hull a bit, but that's a good thing (makes for more stable trailering!) just as long as the chines clear the fenders. I have only an inch of clearance there, but it's never hit, since the boat loads the same way every time.
Suggest you try these changes and let us know how it works out! Denny