Hm I haven't really noticed any loss of responsiveness on mine. I'm not very gently when I tap/swipe on the screen though, so maybe that's a factor.
I do agree though, the fit is awesome. I did have a corner that didn't stay stuck down, however it's slowly getting better after a couple of days being on and now is almost completely fixed.
Lucky me, none of my corners had lift! Glad your issues have subsided.