Frisbee shooter

[rhp3794]

Hi, here are some fotos of our shooter.
We have a mini CIM and a CIM connected directly to two wheels of 6" diameter; the shooter is linear so we have a space between the wall of acrylic and the wheels of about 27 cm. We try to shoot at 30 degrees then in 45, but we stell have problems geting the height (we only get like 1,70m ).
I don´t know were is the problem, maybe it could be the compression of the frisbee or the speed of the wheels (we connect both motors to the battery and I think we achieved good speed)

any help will be great