On an a steep ramp it is geometry... Cut out some cardboard to make a boat outline with the curve of the bow keel and a trailer/winch outline and experiment with a piece of string... As you lift out of the water the bow area contacts the bunks and becomes a fulcrum point - with the boat hull level in the water and the trailer hanging down below at an angle.. As you continue to rise up the ramp more of the stern settles down onto the bunks pivoting on that front contact point, this lever arm forces the clutch on the winch to slip (or something would break)
Lowering the winch height will help on a steep ramp but handicap you on a shallow ramp where you will be trying to crush the bow down into the bunks with the winch... Having the center of pull on the winch cable at the same height as the bow eye is the only solution...
Lubricating the bunk carpet at the time you are pulling the boat and knowing that you will likely have to slam the brakes like everyone else will solve the issue...
1
http://www.boatingsolutions.com/Liquid- ... 908C0.aspx
This stuff is greased lightning - I haven't used it - the warning about launching after using it is to never unhook the boat until it is floating and a line is attached... I suspect one solution is to use it only on the bow area of the bunks and leave the carpet from the helm to the stern unlubricated...
2 Turtle Wax Express Shine Spray Wax - works good
Turtle Wax ICE Synthetic Spray Wax - and others - have not tried the synthetics
3. Pam / any spray cooking oil, canola, whatever - Pam worked for me the one time I used it
4. Bar soap - rub it on the carpet just before hauling - have not done this but I am told it works 'slick'
Two items I am looking at but have not done as yet, is a snap hook on a short chain at the king post to snap onto the bow eye as back up for the winch in case the winch brake ever slips going down the road...
And the other is a breast chain (one each side) going from the bow eye back down to the trailer frame at the first cross member (roughly even with the helm)... What this does is a snub to stop the boat from going over top (or around) the king post in a sudden stop... For the few bucks it will cost it could save you a world of grief... More on this as another topic...