I'm making the SR-72 Darkstar from Top Gun: Maverick and all the wings are at the back, and so are the engines. But my engines have to be really far forward so it doesn't just flip. Also moving the COM even slightly forwards makes it so it doesn't 'pull up', but it still takes off. It's really weird and I would like to know how to fix it. Thanks
Here's a trick that I use with delta wing/irregular wing aircraft: make sure the root connection point is as far back as possible.
(The root connection point is where you connect the wing to the aircraft.)
As far as I'm concerned, the farther back this point is, the more maneuverable your aircraft is. All you have to do is reshape the wing so that the point is at the farthest point in the back of the aircraft, and then place the wing back in its original spot.