SRV Special question

[Subzero]

Well I finally finished my first build. A SRV special using the vero layout by Ulysses (great layout btw ... thnx)
For a first build it went pretty well, took a little debugging to make it work but it works and sounds great!!!
Before I box it I'd like to tweak it a little but as I'm pretty new at all this I'm not sure I understand the schematics correctly

Looks to me like increasing C3 will give more bass and decreasing R8 will clean up the tone in low gain settings. Is this correct ?
Also, how can I get more higs out of it?

once I finish it I can post a build report and some clips if it is of any interest ...

Thnx