As I understand it, evwii tells your SYSTEM the max resolution to scale (stretch OR shrink, up OR down sample) EVERYTHING to by “lying” about your tvs max resolution.
Boot2vwii tells the PROGRAM to give the system a specific resolution to work with without regard for the TVs native or max resolution. If evwii is used TOO, that program will then be scaled FIRST to whatever the system thinks the TVs resolution is and THEN by your tv if it doesn’t match its ACTUAL resolution 1:1