You can charge with anything. The best boarder at my local hill does nothing but carve. You can't tell his switch until he releases his Contrabands at the lift line. Boots make a bigger difference. If my F20's are a little loose my carving gets crappy.
Man...i really need to improve my switch
Deltas are stiff enough for charging. If you want a super responsive binding, just get the SPI or Double Agent then.
Noted...i know SPIs are def uber responsive. I just looking for a tad softer binding than the SPIs without having to go to the revolts...im guessing the Deltas are those. Though, i think I'm set on Targas right now..as long as my local store hasn't sold out.