That sounds about right; the germanium devices always provide much less gain than the BJT or mosFET variety. And if you have it set to treble boost, it's blocking many of the lower frequencies before the boost, so there is even less signal to boost.
One thing I recommend is comparing your resistor color bands to some of those in the Tri Boost gallery to make sure you haven't swapped resistor values somewhere. It's difficult to compare your photos to other photos; much easier to compare the real thing to photos.
If you still have no luck, you can measure the gain and leakage of the OC75 using this method: http://freestompboxes.org/viewtopic.php?f=44&t=9851