Do wheel spacers harm evos in any way cause more stress on anything

 

Not necessarily, the increased stress on the hub/bearing is brought from where you change the position of wheel center (from stock), it changes the bending loads through the bearing, so if you drastically space out wheel center, especially under high corning the stress will be much higher.

A spacer essentially is no different than the wheel it self after its clamped down, if it at least matches the hub mounting diameter of the wheel, you never want to go smaller.

Edit: there is also some impact to the wheel width, but I don't know much about that as I'm not a wheel/bearing designer.