summing node resistors Hamptone DIY mixer

[sleeper]

I've built a line/synth mixer based on this article
(thanks to nimbleswitch for the image, hope you don't mind...)
It works if I bypass the 150k summing node resistors, but with them in the circuit, I'm getting ridiculously low gain from my input sources. I clipped the master volume pot thinking I may have wired it wrong, but even bypassed, I'm getting really low gain.

I'm thinking of changing them out to 10k, that's what i'm seeing on most other basic mixer designs, And I'm wondering why these are so high.
Should 10k cause me some problems here? When I replace the master volume pot, should I lower this value as well?

Thanks
Sleeper

[sleeper]

Oh yeah, I also implemented the decoupling I have 2 busses, (2 jfps in the mixer) as seen in the mic pre drawing, but this 33ohm resistor drops my 24v down to 19v... not sure why this is done either.

sleeper