⟨Kerbinator(no guarantee suggest)⟩ About set orbit:
Seems that the "set orbit" inclination params, for actual inclination params, is added with the body's tilt (relative to your selected parent body's equator)
That comes up today when I'm doing a test that need to launch my rocket into a circular solar orbit within Earth's orbit plane
After a sequence of revert to launch then re-tweak the LAN for multiple times, keep inclination as 23.44 deg resulted in failure,
I decided to try out, read 2body params from KER, and use my tug (as in this screenshot, 1 Mk1-pod+1 ks25+1 FL-T100 with infinite fuel cheat) 
to burn to 0 out of plane in GSE frame quickly, then read KER to find out