March +4 (march+3 instrument, and af3+2 hands) is 15.5% and 12.5% basically, +25% gear haste, 15% spell, 10% hasso leaves you at 78% saddly =|
Depending on how sword strap works, you may be able to cap delay reduction using it, but there's never been any testing done to show if it stacks with haste or works like dual wield and would give you 3% off your new delay after haste is worked out.
Personally, I dunno which is true, I never even thought about it until recently, I always just assumed it stacked with haste until someone tried to say it didn't, but even then, no one has tested it, so no one can say.