After testing from Deschain we confirmed the following with throw + jump:
A non throw proc with a jump is a 1.5x modifier.
A throw proc with jump is a 3x modifier as if the weapon was thrown (vs floating) but it did not get the jump modifier.
The same occurs with a non floating enemy except it’s 2x as if the weapon was thrown.
Also there’s an animation bug with jump + throw proc vs non floating enemy:
basically when it's doing the throw animation against a non-flying enemy, instead of doing the "return jump" animation, he does the throw animation... from where his sprite usually is on the battlefield
so he just never does the returning jump animation