The frame looks similar to a twin loop wideline, except the swingarm is mounted relatively lower. This causes the push of the rear wheel to have a greater moment about the center of gravity, lifting, or reducing the front wheel' s grip on the road, and altering the rake and trail stability....giving that hinged in the middle effect.
Part of the greater moment is the high torque output of the engine. This torque should have been compensated for by swingarm mounting points higher up the frame.
Perhaps the designers intended it to be that way; they may have wanted a bike that was a “wheelie maker”.
Slick