i just want to hear some opinions on this.
most of the time i play cybran but i find no option to deal with percies in late game. reason is obvious.
in engy mod it is possible to spam t3 units once u have the eco for it. it is easier as in "normal" games because you would need tons of engies to get the same build power - but engies would block the outcome of the factory. so it is less efficient as 4 t3 factories with few engies assiting them.
i try to play uef by myself to see how others deals with percie spam - and well they die like i did (or they are uef as well).