[old_tv_nut]

OK! Since the instructions say to use an NTSC input and set the VCR to monitor mode, it must actually be doing color processing in that mode.

So, it does appear that the color frwquency is off, and by multiples of horizontal rate. That is a long way to be off, but the circuit may need that range to sync properly to tape playback.

If you want to try a short-cut (no guarantees), I would say try C525, 3.58 MHz oscillator frequency. Try to keep track of how much you turn it so you can turn it back if it doesn't work.