It really depends on your torso and arm length vs. your leg length (or more properly, your femur length, I guess). In my case, if I try to get my arm angle at 90 degrees at the shoulder (ala FIST fitting) my knees hit the pads. I'm a bit more stretched out now to avoid this, and it works for me.

Where do your arms fit on the pads? Do you have a bar/pad setup where you can move the pads forward? You may be able to keep the same position, just with your arms resting further up on the pads. I actually find this more comfortable, as the nerves near the elbow are sensitive and the forearms aren't.