There's a few things you can do...
*First check the layout against the schematic!
Next, that vox wah follows the same basic schem as the Cry Baby wah (as most wahs do)
-You could decrease that 68k resistor to another value--wire in a pot temporarily to find the exact unity volume. Try between 33k and 47k. This resistor limits the amount of signal going into the circuit
-next you could try different transistors. These seem like they affect the high frequency response and "modern-ness" of the wah. Go with low hfe's for a vintage sound and higher for modern. which transistors did you use? There's a fair chance you've got the pinout flipped around or Q2 (the right most transistor) has too low of HFE.
-If you reduce the 470R resistor, you'll get more volume, more low end, thickness, and growl. This can increase the intensity too.
-Make sure your 100k cap between the pins on the inductor is 100k, this should give it a pretty pronounced effect. stock cry baby is 33k and upwards makes the filter steeper