To answer your first question the original K&K SE has a knob on the back that let you select different cartridge load settings. For MC if I recall it was limited to 100, 300, 1000, and 47k ohms. I had Kevin take the setting for 47k ohms and set up the circuit board so I could plug in resistors to configure my own setting for this position. The new version of the K&K SE has a lot more settings for cartridge loading from what I have heard so maybe this tweak is unnecessary now.
I cannot answer your second question.
I cannot answer your second question.