I have a different view totally on this sorry guys, if you hull can drop in the nose by that much to let the TM hit, I would suggest that something is a miss under the hull, alowing the hull to drop as soon as it leaves the front lower roller. If the hull is supported by the bunks and the fron lower roller is simply guiding the nose up to the winch roller, which you should be able to hit unless something is stopping the hull moving forward.
I'm assuming that your ramp isn't like a cliff face and the boat id way way to deep.
How I unload mine is firstly, I keep my carpeted bunks sprayed with a lubricant, I use the cheap yhtre shine, works great and doesn't make it ball bearing slick.
Secondly I back down until the waters edge before releasing any winch straps, then I tie my rope thats attached to my hull to the post on the front of my trailer. My rope is about 35 feet long, never have too much.
I then undo the winch strap, reverse back and tap the brakes, the boat glides off, I move forward a few feet, step out and grab the rope to guide the boat to the dock or shore.
People always watched amazed at how easy it is and they think that the boat has glided off into the lake.
Everyone has a method for putting it back on and it varies so much from boat to boat, ramp to ramp etc. You need to take a note of what depth your trailer is at when in the water at your most used ramp and then use that as a guide. You should have no issue powering the boat on the trailer slowly if you have your depth correct and trailer set up.
I suggest you have a serious look under your hull and trailer where and how it sits, have someone help you push the boat back fron the winch whilst on dry land and see if and why the boat nose drops ans why it's not supported most of the way off the trailer.