This new version is slower than the old one (at last on my 270s) Old was 4,2M per card and the new one is 3,8M.
Do you run cgminer-heavy-2014-03-19-3.zip? The first one posted today really was slower on many cards (but not on Pitcairn/Tahiti where it was developed), the current one only has surefire optimizations that should benefit all cards.