The MAC bump!
I know what you mean about being difficult to load the boat far forward into the bow V block. The closest I can get is 3-4 inches from the block. My trailer is a 1991 and has the cross V cradles rather than the side bunk rails. Consequently, it is even more difficult to get forward on the trailer. Once my boat is on the trailer, I have NEVER been able to move it - regardless of the bumps. I do not even strap it down while trailering, that is how confident I am that it does not move.If I am going to dry dock my boat, I do not worry about the load. If I am going to derig and travel, I pull it out of the water to the spot where I derig, upon completion and the water having all drained out of the ballast, I then back the boat back into the water until it barely floats, wench it up as tight into the V as possible, then pull out. I repeat this multiple times if needed.I have found the more shadow and less degrees of slope of the ramp works the best.I have mixed opinion on how tight to have the bow wenched to the trailer. If my boat is far forward, it does not seem to make much difference. However, if the boat is sitting back, it really bounces, as you indicate, and sometimes I actually leave the bow strap just snug. When I tried it real tight, it seemed to put a lot of stress on the trailer and the bow wench I am planning a some changes: 1) raise the back V cradle 2-3 inches which should improve loading and trailering as well.2) I am going to install a lower hitch to my Ford Ranger 4X4. This bumper sits higher than my old one and consequently causes the boat to weave at 65-70 MPH if I get much below 1/2 tank of gas. Of course with a FORD, trying to keep more than a 1/2 tank of gas is IMPOSSIBLE!!3) I put new larger tires on, Carlisle ST 225/75/15 which has load range of 2500 pounds EACH. Tires were about $70 each, rims at junk yard, $15 each. Now I have 2 spares which I do not anticipate ever needing. The idea of a blow out at high speeds really concern me.Good luck.