More Volume from splitter

[jghfslk]

I just finished a pedal with a splitter and blend so I can put effects in series and parallel. 
I used this splitter:
schematic   http://www.muzique.com/lab/splitter.htm   
layout   http://tagboardeffects.blogspot.com/2014/08/amz-2-channel-splitter.html
and this mixer:
schematic   http://runoffgroove.com/splitter-blend.html
layout   http://www.sabrotone.com/?attachment_id=3039
I would like to get some more volume out of either the splitter or the mixer.  Is it possible without adding an additional circuit like an lpb-1?  I seem to get unity gain when using my effects in parallel but in series there is a noticeable drop in volume compared to bypass.
Anyone have any ideas?
Thanks!