Does this page 7 match your Sams? Clearly shows the front local oscillator adjustments along with the channel number designations. I would think as long as you've already twerkulated your IF slugs there would be very little harm in trying to fine tune the oscillator adj. associated with either channel 3 or 4. This drawing also explains why your channel positions don't match mine.
https://live.staticflickr.com/65535/...252c2ebc_o.jpg