Overlap is what can kills vacuum, which is a combination of lsa and duration, people generally will sacrifice lsa for more duration, DV position is to do the opposite, run the required lsa (builds more low and mid torque) and sacrifice duration instead for acceptable overlap.
Now I haven't seen any dyno test that been designed exclusively to compare this out. We know generally a tighter lsa will gain low/mid torque from the test I've seen about an average of 2-4 lbs-ft per degree of lsa, but that's with the same duration so who knows if gain is the same/better/worse with less duration to keep similar overlap.