It's not +1 merit though ... otherwise +1 Store TP would be +2 Store TP.
EDIT: Just to be clear in case we're debating the same point but misunderstanding each other because of semantics issues,
I am saying that +5 Snapshot = +5% Snapshot = 10% Delay Reduction, other theory is that +5 Snapshot = +10% Snapshot = 20% Delay Reduction.
EDIT2: Lol, re-reading it again it seems I misread what you said from the start! I blame it being 3am; +5 Snapshot = +5% Snapshot = 10% Delay Reduction. For some reason I misread you as saying that +1 Snapshot = +2% Snapshot (and hence 4% Delay Reduction) <_<