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Ordinarily, a 15-18 foot pennant ought to be plenty. The mooring system itself should have all the required scope, so don't think of the pennant as a way to add scope. A longer pennant isn't necessarily better, and ultimately the length of your pennant will be constrained by the amount of swing room available in the mooring field.
What concerns me more is that you seem to imply that you use two pennants simultaneously. In my opinion that is inadvisable, and is what caused you to lose the dolphin striker last year. Twin pennants, whether used independantly or in combination with a bridle, tend to get wound up and fouled, resulting in chaffing and binding.
On our boat, as is customary in my region, we use a single pennant through either the port or starboard hawse hole (we do not bring the pennant through the centerline anchor roller.) The boat rides ever so slightly off center on the mooring, which keeps it more stable in the wind and makes it much less prone to "sail" back and forth at the mooring. The key is to right size the diameter of the pennant. For your boat I'd use a single 3/4-1" Yale premium mooring pennant.
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