Hi, Sheldon
These settings are easy to get confused.
Slow-Jog-Rate is in % of your "G00" speed (Which is the "Velocity" setting in Config, Motor Tuning).
Shift + Arrow Key is (100 % Slow-Jog-Rate) or G00 (Which is the "Velocity" setting in Config, Motor Tuning).
Feed-Rate is inch/mm/Units per minute.
Pic 1, Shift+Arrow 100 % Velocity setting.
Pic 2 Arrow key Slow-Jog-Rate 1 % "Velocity" setting.
Hope this Helps, Chip