Since you mention it's not always the same side, I'd have to say it's how your loading onto the trailer and or like mentioned how far you back the trailer into the water. For me, I back down till the top front of the trailer fender is just above the water line, depending on how steep the ramp is, I have learned how to adjust from there. Some ramps I have to go just under the waterline with the top edge of the fender, most like I mentioned, some I have to have only half of the fender under water. But it is a pretty good guide line to start with for your style /make boat. Some of my old team members ran those same models and it worked when I was with them also. I run a 18ft Cliner. You can once your boat is loaded correctly slide under the trailer and see if the bunks are adjusted properly to support the hull, make adjustments where needed. Those trailers are design more for "drive on" style loading like a bass boat, so if you back far enough into the water to where you don't have to crank the boat very far up to the trailer tongue, you have to play with getting the boat to sit perfect on the bunks as you pull out of the water. You could mount some guide ons, when properly set they will force your boat into position on the trailer. Just a tought.