I am half an inch taller and 5 pounds heavier than you. And maybe older - have hit full retirement age. The too heavy part is often a matter of how you are handling the boat, and the tools you have, as much as the pure weight of the boat.
In the interest of full disclosure, I did finally find the money for a Hullivator on one side when I went to a car with a couple of inches more height on the roof, and I generally try to focus on the boats that come in around 50 pounds rather than 65 these days. But I can load two 16 ft plus boats on the roof myself without damaging my back. On one side is is Thule glide pads rear and saddles front, for that I use the Amagansett Roller Loader to get the boat between ground and roof. The other side is the Hullivator, which is a wonder thru most of the range of motion but still involves a bit of a dead lift to get it into the cradle arms.
But I can handle the 65 and 70 pound boat if I need to, with the above systems.
I have a good cart to get the boats between the car and the launch, or the car and close to where I hang them under the porch out back. (The last few feet of how I get them under the porch would bother the heck out of anyone who is into pristine boats.)
Another idea that works well for between the roof and a set of saddles or glide pads or whatever is a bar that comes out from the side of the cross bars. You get the nose of the boat over that then swing it up. For the most part you are never carrying the full weight of the boat. And this technique may be easier for sedans. I have never had any use for a car that was not a hatch or wagon, so sedan owners may have better ideas here.
This all works a lot easier on a boat with perimeter lines, gives you something to grab when sliding it between.
My concern is that you will still be spending a decent chunk of change for a new boat, only to find you have tied up bucks for something that does not achieve the goal.
You could go a couple of ways. My first recommendation, since you are stepping up anyway, is to not try for a new forever boat right now. Get a used boat which will give you a chance to get used to having more capability. Spend some time in that then worry about the longer term hold. And if it is used and you drop it while getting used to handling it, you haven’t horrifically damaged your investment. It’ll also leave you budget room to get tools for handling the boat that will serve you long term.
The other is to review how you are handling the boats, see if there is a way to make that easier by getting some tools.
The bigger guys are welcome to blow out their backs hefting things the hard way. At our size, tools is everything.,
What region are you in? There are some on this board, like Willowleaf, who are geniuses at spotting ads for really good ideas in used boats.