What were the speed mods again? Just a thought, I think if I remember correctly, someone mentioned it before:
12% = Wlegs/Skadi/Strider/anything else
(no info on BRD songs myself)
25% = Ninja Boots
50% = Chocobo
100% = Flee
200% = Hacks
Rental Chocobo: +100% Movement Speed
Flee: +100% Movement Speed
Hermes Quencher medicine: +100% Movement Speed
Ninja Kyahan at night: +25% Movement Speed
Ninja Kyahan+1 from dusk to dawn: +25% Movement Speed
Chocobo Jig ability: +25% Movement Speed
Chocobo Mazurka spell: +25% Movement Speed
Raptor Mazurka spell: +12% Movement Speed
Crimson Cuisses: +12% Movement Speed
Strider Boots: +12% Movement Speed
Trotter Boots: +12% Movement Speed
Herald's Gaiters: +12% Movement Speed
Skadi's Jambeaux: +12% Movement Speed
Desert Boots during earth weather: +12% Movement Speed
Storm Crackows during Assault: +12% Movement Speed
Federation Aketon in Windurst: +12% Movement Speed
Kingdom Aketon in San d'Oria: +12% Movement Speed
Republic Aketon in Bastok: +12% Movement Speed
Pitchfork +1 in Costume: +12% Movement Speed
Chocobo called via Chocobo Whistle: +??% Movement Speed, based on chocobo's Strength.
Sprinter's Shoes enchantment: +12% Movement Speed
Weight inflicted from the spell Gravity: -50% Movement Speed
Weight inflicted from other abilities: -??% Movement Speed, varying by ability.
Dusk Jerkin Set: -??% Movement Speed; effect increases with amount of pieces worn
*
Boosts to movement from multiple pieces of equipment will not stack with each other. The largest boost is the one the player will receive.
* Mazurka and Gravity will stack with each other and with equipment. Both Mazurka will not stack with each other, but a Mazurka will stack with a speed boost from equipment.
* Nothing stacks with Flee or a Chocobo.
* Flee will overwrite some forms of Gravity.
o Flee will also overwrite the effect of Sprinter's Shoes.
* The effect of Sprinter's Shoes stacks with most movement speed enhancing gear.
All taken from Wiki:
http://wiki.ffxiclopedia.org/wiki/Movement_Speed