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Mr_B
just out of curiosity, what cadence are you aiming for when sprinting? if you are customising cassettes, why not have your top "gun it" gear 12t, or even 13t. the gear rations for 11t are just stupid, and nobody can spin them up.
typical track gear inches for sprint events are 92-94 GI and they sprint at 70km/h+
if you are a standard chainset 53t/11t is an enormous 126 inches. at 70km/h your cadence would only be 122, not exactly high when sprinting.
If you went to a low of 12 or 13t, your jumps would also be much smaller, thus easing your transitions.