I never hook the strap up to the bow eye when I pull the boat out but that's just me. Couple of reasons why: First off, on a crowded ramp one
person can back the trailer in, the other drives the boat up to the bow stop, then pull out...it's quick. Second, (I own a Nautique dealership so a lot of our boat have turnbuckle hooks in the front) ,this is a problem because once the bow lifts up when the boat comes out of the water, it will be pulling against the turnbuckle and you'll never be able to get it off.
Just to let you know, the way an inboard ski boat trailer is made (carpeted bunks, the overall shape of the bunks/trailer), it is very very hard, almost impossible for a boat to slide off backwards.
On the contrary, those of you that have nautiques with only a turnbuckle hook at the front of the trailer should always use a heavy duty tie down strap, instead of the turnbuckle, hold the boat on when retrieving from a long and/or steep ramp
Also, since Nautique trailers (ram-lin,eagle,etc...)have bow stops, I always do a "hard" stop after I pull the boat out to snug it up to the front of the trailer. (makes it trailer better) sorry for the long post, just wanted to let you know how i do it