L-Jetronic resistor values

[lconley at hns.com]

Blueprinting a BMW K-75S motorcycle. Anticipate HP
peak will move forward due to retarding intake cam profile.

I'm looking to move the timing retardation and fuel cutoff
on the L-Jetronic about 500 RPM further out from the 8777
RPM and 8905 RPM points.

Can someone steer me towards the appropriate resistors?
Direction of resistance change? Amount of change?
Any other related tidbits? Related reading?

TIA, Lou "Louge" Conley