Have you tried a collapsible brace/stock? I've always like the look & function but after I actually got one for my mp5 (clone), I don't like it.
The check weld is uncomfortable almost nonexistent, changed sight height and causes some movement / wiggle in the stock.
Granted it wasn't on an evo but I'm assuming there similar in construction?
Maybe they've improved or has a better design but it's something you may want to inquire about.