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Marc -

Just in case you don't already know, the bow stop should be just touching the top of the bow eye and the strap below it pulling straight.

This keeps the bow riding up and over in a crash.

In my experience each ramp is different.

I used to launch onto one tidal river (Eliot ME, Piscatisqua River) that had a wicked steep ramp and a fast 4-6 mph current. Learned very quickly not to dunk too far, just to the point before the stern would lift off bunks. It was just enough to hold the boat. I then pushed (4 keel rollers and bunks) it off by hand.

Retrieval was opposite. Dunk so the boat would float almost to the bow stop. Minimal winching. If too shallow, the current would swing the boat off center when trying to winch it on.

I extended my trailer tongue and added stern side rollers to help. See photos on my personal page and in my trailer project album.