The weigh safe hitch doesn’t go any lower but with a heavy weight it might balance out.I use the front hitch to park as close to my garage as possible and of course it’s lower now too.
Yes the recommended tongue weight is 10 -15% of the loaded trailer in other words it’s used to put enough weight to keep control of the trailer without overloading the hitch. It’s a first gen the new ones are more expensive and complicated.