Panel causing reduced throttle movement

Hey guys,I have the freeware XB-70 aircraft. It flies at Mach 3.0. The default panel is, well, crappy. So I installed a known working B747 panel. When I takeoff or fly in the XB-70 now (w/ the 747 panel) I can't get the throttles beyond 100% (thus no afterburners). If i reinstall the default panel, throttles work fine, I get afterburners, get Mach 3.0. With the 747 panel, I don't get the ability to accelerate to Mach 3.0 because the throttles only go to 100%. Has anyone seen an issue where a panel will restrict your throttle movement or prevent your throttle from going to 110%? I know this is a non-standard setup, but I really want the 747 panel to work. What can I do to possibly fix that? Any suggestions? Thanks,Derald