Thanks George, that's what we did (all week). We were on a Bali 4.5 cat, and we always passed two dock lines through the mooring pennant - one from and back to each bow cleat - making a bridle separate from the anchor bridle. Even when we shortened the bridle so the pennant was right under the crossbeam, so a hull wouldn't sail over it any more, there was still enough slack in the mooring line for the ball to bump a hull (AFAIK it never bumped the nacelle).

Cheers,
Randy